New Braunfels
- Gruene2.7 mi
- Canyon Lake dam12.2 mi
- Natural Bridge Caverns13.1 mi
- Seguin13.3 mi
- San Marcos and Texas State16.6 mi
- Downtown San Antonio29.4 mi, just outside
- Downtown Austin45.1 mi, well outside
SISTER TOWNS / EL SEGUNDO, CA + NEW BRAUNFELS, TX
El Segundo
and New Braunfels.
One town is full, the other is filling fast. They sit 1,224 miles apart. Here is how they compare, what each could teach the other, and a knowledge tree they can pass back and forth.
Checked Nov 8, 2026. Every figure links its source below. Distances are straight-line miles worked out on this page.
SIDE BY SIDE
The numbers,
next to each other.
Census figures for income, degrees, homes and commute are 2020-2024 American Community Survey estimates for both towns. The jobs row compares two different measures, so read it as scale, not a match.
| Measure | New Braunfels, TX | El Segundo, CA |
|---|---|---|
| Founded or incorporated | Founded 18451 | Incorporated 19172 |
| Population, 2020 Census | 90,4033 | 17,2724 |
| Population, July 2025 estimate | 122,4923 | 16,3794 |
| Land area | 45.18 sq mi3 | 5.46 sq mi4 |
| Median household income | $86,0213 | $150,7374 |
| Bachelor's degree or higher | 38.6%3 | 62.7%4 |
| Median home value | $339,4003 | $1,587,5004 |
| Homes lived in by their owners | 65.3%3 | 42.5%4 |
| Mean commute | 27.1 min3 | 23.6 min4 |
| Jobs | More than 62,000 (2023)5 | 70,000+ workforce6 |
| Rail | None. A Georgetown to San Antonio commuter line was dropped in 2016.7 | Metro K Line: Mariposa, El Segundo and Douglas stations8 |
| People inside 25 miles | Unavailable | About 8.0 million (tract estimate)9 |
INSIDE THE 25 MILES
Two circles,
drawn the same way.
New Braunfels shares a metro name with San Antonio, yet downtown San Antonio sits just outside its 25-mile circle. El Segundo's circle holds downtown LA and about 8.0 million people.calc
El Segundo
- LMU3.5 mi
- SoFi Stadium5.0 mi
- Santa Monica Pier7.8 mi
- USC and UCLA10.4 and 10.5 mi
- Downtown LA City Hall13.6 mi
- Port of Los Angeles15.4 mi
- Downtown Long Beach16.4 mi
- Pasadena22.2 mi
WHERE THEY CONNECT
Shared traits, mirror images,
things to trade.
Shared: alike. Mirror: the same thing, flipped. Teach: what one town could hand the other.
Mirror
One town is full, the other is filling
New Braunfels grew from 90,394 in April 2020 to 122,492 in July 2025, about 35.5%. El Segundo went from 17,272 at the 2020 Census to an estimated 16,379. One site would track what's new every week. The other tracks what stays.34
Mirror
Water in, water out
The Comal Springs are the largest group of natural springs in Texas, and the 2.5-mile Comal River is the shortest navigable river in the state, with about a quarter million river users each summer. El Segundo's water story runs the other way: the ocean, and Hyperion, LA's oldest and largest wastewater plant, just north of the city line.101112
Shared
Two old halls, still playing
Gruene Hall, built in 1878, is billed as Texas' oldest continually operating dance hall. El Segundo's State Theatre opened in 1921 for refinery workers and still plays a Mighty Wurlitzer.1314
Mirror
Festival crowd, weekday crowd
New Braunfels draws more than 240,000 visitors a year to Wurstfest, plus the summer river crowd. El Segundo's crowd comes Monday to Friday: a workforce of 70,000+.15116
Shared
Named for a prince, named for a refinery
New Braunfels was founded in 1845 under the Adelsverein and takes its name from Prince Carl of Solms-Braunfels. El Segundo means "the second" in Spanish, for the second Standard Oil refinery on the West Coast. Both names tell you who showed up first.116
Teach
What each could hand the other
New Braunfels runs a river for a quarter million summer users, and that operations playbook is something El Segundo's beach days could learn from. El Segundo's source ledger suits a town adding thousands of residents a year, where last year's facts go stale fastest.113
FOR FUN / A THOUGHT EXPERIMENT
A knowledge tree
sister towns can share.
Like a strategy game's tech tree: each node is a playbook one town unlocks, then hands to the next. Knowledge gets cheaper once a neighbor has it. Wonders stay home.
Unlocked in El SegundoOpenNew, nobody has it yetNew Braunfels's first five
Era I Foundations
What every 25-mile site needs before anything else.
CivicSource ledger
Every fact quotes a public page, with the day it was checked. Unknown stays unknown.
Needs: nothing
Passes as: Ten publishing rules, written so they work in any town.
El Segundo: Live: every source this site reads.
New Braunfels first move: Start from the city's site, the Texas State Historical Association and Census tables.
Civic25-mile circle
Pick a center point, draw the circle, and count who lives inside it.
Needs: nothing
Passes as: A center point, a radius and a census method that can be rerun.
El Segundo: Live: 2,087 census tracts inside the circle.
New Braunfels first move: Center it on the city: San Marcos lands inside, downtown San Antonio just misses.
CivicPlace pages
One page per park, court, pool, landmark and station, each fact dated.
Needs: Source ledger
Passes as: A page template and a short list of official sources to check first.
El Segundo: Live: one page per place in town.
New Braunfels first move: Landa Park, Comal Springs, Gruene.
CivicTown calendar
Dated events from organizers, kept apart from rumors.
Needs: Source ledger
Passes as: An events schema and the rule that every listing names its organizer.
El Segundo: Live.
New Braunfels first move: Festival season is the town's calendar spine.
Era II Commons
The everyday things neighbors look up.
CivicPublic meetings, plainly
What the town's governing body meets about this week, in plain words.
Needs: Town calendar
Passes as: A meeting-week template that works for a council or a Town Meeting.
El Segundo: Live: council week ahead.
CivicHere guides
A short phone guide to keep open where you're standing.
Needs: Place pages
Passes as: A five-minute and one-hour format per spot.
El Segundo: Live: seven spots.
CivicGetting around
Rail, buses, bikes and the gaps, inside the circle.
Needs: 25-mile circle
Passes as: A transit checklist that names the operator for every claim.
El Segundo: Live.
SportPickleball board
Courts, drop-ins, leagues and results.
Needs: Place pages
Passes as: A court page format and a results feed.
El Segundo: Live.
FoodFood inside the circle
What's grown and caught nearby, market days and grocers.
Needs: 25-mile circle
Passes as: A food-access checklist and its official data sources.
El Segundo: Live.
Era III Craft and trade
Where the town works, eats and builds.
BusinessBusiness directory
Local businesses as dated records, not endorsements.
Needs: Place pages
Passes as: A directory schema and the rule that hours come from the business.
El Segundo: Live.
FoodWhere to eat and drink
Restaurants and breweries inside the circle, each with its source.
Needs: Business directory
Passes as: A guide format that credits whoever rated or listed a place.
El Segundo: Live.
BusinessJobs board
Openings from employers' own pages.
Needs: Business directory
Passes as: A jobs feed that links every posting to the employer.
El Segundo: Live.
BusinessDevelopment tracker
What's being built inside the circle, with public numbers only.
Needs: 25-mile circle
Passes as: A project record with a status and a source per change.
El Segundo: Live.
CraftBuildings catalog
The buildings worth knowing, one page each.
Needs: Place pages
Passes as: A building page format with facts first and sources last.
El Segundo: Live.
SoundTown sound
Where the town makes music: its halls, its instruments, its nights out.
Needs: Place pages, Town calendar
Passes as: A sound map format: venue, instrument, history, next show.
El Segundo: Open in all three towns. El Segundo's anchor would be Old Town Music Hall.
New Braunfels first move: Begin with Gruene Hall.
Era IV Networks
The machine-readable side, and the AIs that keep it.
AIOpen university
Free lessons on using AI well, taught from local examples.
Needs: Source ledger
Passes as: A lesson format and a rubric.
El Segundo: Live.
AIMachine side
A read-only API and MCP server with the same facts as the pages.
Needs: Source ledger, Place pages
Passes as: The endpoint shapes and the rule that bots get the same sources as people.
El Segundo: Live.
AIDaily briefing
An automatic, source-linked morning draft.
Needs: Town calendar, Machine side
Passes as: The briefing pipeline and its fact-check gate.
El Segundo: Live.
AIVisitor center for agents
A front door for visiting AI agents: what to read, what not to do.
Needs: Machine side
Passes as: A guide page and a manifest file.
El Segundo: Live.
AIAI desk
Three AIs (Claude, ChatGPT and Grok) share one job queue in git, claim work and check each other.
Needs: Machine side
Passes as: A board file, one command to claim and hand off, and an overlap check.
El Segundo: Running, behind the scenes. It built this page.
Era V The exchange
New. Nobody has these yet. Sister towns unlock them together.
AISister-town ping
Each site publishes what it has unlocked in one small file. Sister sites read each other's and pick up a playbook that has already run somewhere.
Needs: AI desk, Machine side
Passes as: One file: /knowledge-tree.json on this site.
El Segundo: First version published with this page.
CivicShared stories
When something matters in both towns (a new state rule, a heat wave, a national story), one town researches it and both publish, each with its own local angle.
Needs: Sister-town ping, Daily briefing
Passes as: A story card with sources, plus a slot for each town's local fact.
El Segundo: Proposed.
BusinessPlaybook trade
A town that runs a playbook well writes down what broke. The next town starts there.
Needs: Sister-town ping
Passes as: A short 'what we learned' note attached to each unlocked node.
El Segundo: Proposed.
Wonders
El Segundo
The space and aerospace companies in and around El Segundo. A wonder stays home: other towns can visit it, not copy it.
Medway
The bell and mill trail
Proposed: East Medway's bell foundry, the Charles River mills and Medway Village, as one walk.
New Braunfels
The spring-fed river
Proposed: Comal Springs, the 2.5-mile Comal River and Gruene Hall, as one guide.
HOW KNOWLEDGE PASSES
Four rails,
no new server.
Everything here runs in the cloud. Nothing depends on one person's computer.
The playbook
Each node is a written recipe: the rules, the sources to check first, the page format. The rules are already town-agnostic, so they read the same in any town.
One config file
This site runs from one codebase where a town is one file: its name, center point, weather station and official sources. A sister town starts by adding its own.
The AI desk
AIs claim the job of unlocking a node for a town on a shared board, and a different model checks the work before anything goes up.
The ping
Each site publishes what it has unlocked in one small file. El Segundo's is /knowledge-tree.json. Sister sites read each other's and pick up what already works.
START YOUR OWN
Start New Braunfels' own 25-mile site
This site already runs from one codebase where a town is one config file. El Segundo is live and Manhattan Beach is in draft. A New Braunfels site would start as one more file, then unlock the tree one node at a time.
An idea on a page. No New Braunfels site exists yet, and nothing here is a launched program.
The first five unlocks
- Source ledger. Start from the city's site, the Texas State Historical Association and Census tables.
- 25-mile circle. Center it on the city: San Marcos lands inside, downtown San Antonio just misses.
- Place pages. Landa Park, Comal Springs, Gruene.
- Town calendar. Festival season is the town's calendar spine.
- Town sound. Begin with Gruene Hall.
How it connects back
- Shared stories. When a story matters in both towns, one researches it and both publish, each with its own local fact.
- The ping. Each site's tree file says what it has unlocked, so either AI desk can pick up the other's playbook.
- Same rules. Cite it or cut it, unknown stays unknown, say what's AI.
- Its own wonder. The spring-fed river: Comal Springs, the 2.5-mile Comal River and Gruene Hall, as one guide.
The other sister town: El Segundo and Medway →
SOURCES
Every figure,
quoted.
Read on Nov 8, 2026. Quotes are word for word from each page. Labels: fact (official), listing (venue or organizer), reported (one outlet or reference work), estimate (calculated).
Texas State Historical Association, Handbook of Texas: New Braunfels fact
It was founded on March 21, 1845, when, under the auspices of the Adelsverein · Prince Carl of Solms-Braunfels, the first commissioner general of the Adelsverein · is at the confluence of the Guadalupe and Comal rivers
City of El Segundo, Annual Comprehensive Financial Report, FY ended June 30, 2023 fact
The City has operated under the Council-Manager Form of Government since 1917.
U.S. Census Bureau, QuickFacts: New Braunfels city, Texas fact
Population, Census, April 1, 2010: 57,740 · Population, Census, April 1, 2020: 90,403 · Population estimates, July 1, 2025, (V2025): 122,492 · Population estimates base, April 1, 2020, (V2025): 90,394 · Land area in square miles, 2020: 45.18 · Median households income (in 2024 dollars), 2020-2024: $86,021 · Bachelor's degree or higher, percent of persons age 25 years+, 2020-2024: 38.6% · Median value of owner-occupied housing units, 2020-2024: $339,400 · Owner-occupied housing unit rate, 2020-2024: 65.3% · Mean travel time to work (minutes), workers age 16 years+, 2020-2024: 27.1
U.S. Census Bureau, QuickFacts: El Segundo city, California fact
Population, Census, April 1, 2020: 17,272 · Population estimates, July 1, 2025, (V2025): 16,379 · Land area in square miles, 2020: 5.46 · Median households income (in 2024 dollars), 2020-2024: $150,737 · Bachelor's degree or higher, percent of persons age 25 years+, 2020-2024: 62.7% · Median value of owner-occupied housing units, 2020-2024: $1,587,500 · Owner-occupied housing unit rate, 2020-2024: 42.5% · Mean travel time to work (minutes), workers age 16 years+, 2020-2024: 23.6
City of New Braunfels, FY 2023 Popular Annual Financial Report fact
overall jobs increase from around 46,000 to more than 62,000 in 2023
City of El Segundo economic development, community snapshot fact
Workforce Population = 70,000+
KUT, Oct 18, 2016 reported
a proposal to build a commuter rail line from Georgetown to San Antonio is now dead.
Torrance Transit, Metro C and K Line re-alignment fact
will become part of the south segment of the K Line · as well as the Douglas and Redondo Beach Stations.
elsegundo.xyz, 25-mile civic atlas estimate
2,087 tracts · 8.0 million residents
Texas State Historical Association, Handbook of Texas: Comal Springs fact
The Comal Springs, the largest group of natural springs in Texas, is on the northwestern edge of New Braunfels
City of New Braunfels, River Operations fact
At approx. 2.5 miles long, the Comal River is the shortest navigable river in Texas. · With approximately a quarter million river users each summer
LA Sanitation, Hyperion Water Reclamation Plant fact
oldest and largest
Visit New Braunfels, Gruene Hall listing
Gruene Hall, built in 1878, is Texas’ oldest continually operating and most famous dance hall.
Los Angeles Conservancy, Old Town Music Hall listing
The State Theatre, originally opened in 1921 as a live performance venue for employees of the nearby Standard Oil Refinery, · Home to a Mighty Wurlitzer theatre organ
Visit New Braunfels, Wurstfest guide listing
drawing more than 240,000 visitors each year
Wikipedia, El Segundo, California (history) reported
The city acquired its name ("the second" in Spanish) due to being the second Standard Oil refinery on the West Coast
Method and limits
Distances are great-circle miles between published coordinates, not driving miles. El Segundo's 25-mile population is this site's own census tract estimate, not an exact circle count. No source gave a 25-mile population for New Braunfels, so it shows as unavailable. Census estimates carry margins of error; where towns differ by a point or two, treat them as about the same. The knowledge tree is a thought experiment, kept apart from the facts above.
Drafted by Claude (Anthropic) from 16 cited sources, with research by Claude. A second read by ChatGPT is queued. Approved by Michael Hoydich. Corrections: share an update.