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US ZIP Code Profile

ZIP Code 78575
Olmito, Texas

ZIP code 78575 is in Olmito, located in Cameron County, Texas, within the Brownsville-Harlingen metro area. Its 2020 Census population was 5,270. The estimated median adjusted gross income per tax return is $41,935, and about 8% of filers report $200,000 or more.

2020 Population
5,270
Census ZCTA
County
Cameron
FIPS 48061
Median income (est.)
$41,935
IRS SOI 2022
Land Area
12.342 mi²
+ 0.518 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CityOlmito, TX
CountyCameron County (FIPS 48061)
StateTexas (FIPS 48)
Metro Area (MSA)Brownsville-Harlingen, TX Metro Area (15180)
Census Region / DivisionSouth Region · West South Central Division
Coordinates26.021915, -97.526276
Land / Water Area12.342 mi² land · 0.518 mi² water

02Income & Economics

Distribution of the 2,600 individual tax returns filed in 78575 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
33.9%
$25K–$50K
23.8%
$50K–$75K
13.9%
$75K–$100K
7.3%
$100K–$200K
13.1%
$200K+
8.1%
The $200,000+ bracket accounts for 47% of 78575's total adjusted gross income, from 8% of returns — a concentration that drives the gap between the median ($41,935) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 78575's IRS income metrics, 2020–2022.

Median income (2021→2022)
$41,935
▲ 6.4%
Filers earning $200K+
8.1%
▲ 0.7 pt
Total filers
2,600
▲ 1.6%
GET /zipc/v2/zipcodes/78575/soi?year=… $37K 2020 $39K 2021 $42K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 78575 ZCTA.

2000
3,729
 
2010
8,056
▲ +116.0%
2020
5,270
▼ -34.6%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortC
USPS Finance Number486615
City AliasesOlmito, Rancho Viejo

06Frequently Asked Questions

What county is ZIP code 78575 in?

ZIP code 78575 is in Cameron County, Texas (county FIPS code 48061).

What city is ZIP code 78575?

The primary USPS city for 78575 is Olmito, TX.

What metro area (MSA) is 78575 in?

78575 is part of the Brownsville-Harlingen, TX Metro Area (MSA code 15180).

What is the population of ZIP code 78575?

The 2020 Census population of 78575 was 5,270 residents.

What is the median income in ZIP code 78575?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78575 is about $41,935, with around 8% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.