PlainZIP

San Marcos, TX

Single-footprint Census roll-up for San Marcos, TX: 1 USPS ZIP, population 63,836. Open the primary ZIP for household income, housing tenure, and commute from ACS 2023 5-Year Estimates.

U.S. Census Bureau, SimpleMaps US ZIP Code Database, delivery-area ZIP coverage

ACS city ledger plate

Sheet SAN-MARCOS-TX · San Marcos, TX 1 ZIPs · 63,836 pop · #20082/25278 · Guadalupe County

INC-MID · RANK-LOWER · BELOW-PEER · BOOK-ONE · OWN-RENT · POP-SMALL · SPREAD-UNK · HOME-MID

  • INC-MID $54,737
  • RANK-LOWER #20082/25278
  • BELOW-PEER under Kingsbury
  • BOOK-ONE 1 ZIP
  • OWN-RENT 38% owners
  • POP-SMALL 63,836
  • SPREAD-UNK Single-ZIP book
  • HOME-MID $306,700

Nearest income peer: Kingsbury, TX (+ $14,513 income $)

Instrument codes from this city’s ACS household income, national rank, county-peer gap, ZIP book, owner tenure, population scale, intra-city income spread, and home-value band, not a moving recommendation.

Income neighbourhood around San Marcos

Lowest/highest poles plus county-sharing cities nearest San Marcos on average ZIP median household income. Full ladder: /cities.

median HH income

What this shows County-sharing peers only, not the full US city board. Open a near peer when the gap is small; open the poles when the mosaic is wide.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2026-08-25

National city placement

According to ACS 5-Year Estimates, San Marcos, TX sits among US cities with one of the lowest household incomes among US cities, on a small-city population base, across a single-ZIP footprint.

21st pct
household income vs 25,278 US cities
63,836
city population (Census)
1
USPS ZIP codes covered
$54,737
avg ZIP median income

Income percentile ranks this city's average ZIP median household income against 25,278 US cities with ACS income on at least one ZIP. Scale and ZIP-spread words come from Census population and USPS ZIP coverage.

Lower-income footing on only 1 ZIP ($54,737 average) · poverty 23.8%. The primary code (78666) carries the ACS household fields that matter.

Owner-occupancy is comparatively low (38.1%) for this income tier, rent $1,319 may matter more than the home-value average.

Within Texas, Telephone is the closest lower-income city and Robstown the closest higher-income city by average ZIP household income. Their 1 and 1 ZIP footprints are the immediate statewide comparison set for San Marcos.

Population concentration

San Marcos reads through its lone ZIP, 78666

63,836 ACS residents, one ZIP: 78666 is not the leading code inside San Marcos, it is the only one on file. Treat the ZIP page as the primary source for anything below the city-wide total.

Census ZBP business roll-up

Dense ZBP book packed into San Marcos's one ZIP

Citywide ZBP: 1,880 establishments, 34,315 employees , annual payroll $1,555,086k (~29 establishments per 1,000 residents) across 1 of 1 ZIPs. Peak business ZIP 78666 (1,880 units) ; leading NAICS Retail trade (393) · also Accommodation and food services · Health care and social assistance .

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ZIP Codes in San Marcos, TX

These ZIP codes sit in Guadalupe County, which covers 8 ZIP codes in all; 1 of them fall in San Marcos. See the Guadalupe County roll-up →

Every one of the 7 cities sharing Guadalupe County reports a higher average ZIP median income than San Marcos, Seguin, Schertz and Cibolo among them. That gap is the county's income spread, not a measure of the housing or commute picture below. Cibolo marks the far end of that range at $113,004, 106% above San Marcos.

ZIP Code Population Median income Establishments Density
78666 63,836 $54,737 1,880 140
How we build city roll-ups · Guide: reading ZIP code data · BLS wages

San Marcos roll-ups here are for informational purposes only and do not constitute financial or relocation advice. ACS and Census ZBP figures are estimates; confirm the current table against Census before a money or move decision involving San Marcos, .