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US ZIP Code Profile

ZIP Code 77861
Iola, Texas

ZIP code 77861 is in Iola, located in Grimes County, Texas. Its 2020 Census population was 2,850. The estimated median adjusted gross income per tax return is $67,105, and about 10% of filers report $200,000 or more.

2020 Population
2,850
Census ZCTA
County
Grimes
FIPS 48185
Median income (est.)
$67,105
IRS SOI 2022
Land Area
127.415 mi²
+ 3.816 mi² water

01Location & Geography

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

Primary CityIola, TX
CountyGrimes County (FIPS 48185)
StateTexas (FIPS 48)
Census Region / DivisionSouth Region · West South Central Division
Coordinates30.721716, -96.1093
Land / Water Area127.415 mi² land · 3.816 mi² water

02Income & Economics

Distribution of the 1,500 individual tax returns filed in 77861 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
24.0%
$25K–$50K
17.3%
$50K–$75K
12.7%
$75K–$100K
10.0%
$100K–$200K
26.0%
$200K+
10.0%
The $200,000+ bracket accounts for 35% of 77861's total adjusted gross income, from 10% of returns — a concentration that drives the gap between the median ($67,105) 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 77861's IRS income metrics, 2020–2022.

Median income (2021→2022)
$67,105
▲ 15.0%
Filers earning $200K+
10.0%
▲ 1.1 pt
Total filers
1,500
▲ 2.7%
GET /zipc/v2/zipcodes/77861/soi?year=… $55K 2020 $58K 2021 $67K 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 77861 ZCTA.

2000
1,866
 
2010
2,506
▲ +34.3%
2020
2,850
▲ +13.7%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortC
USPS Finance Number484315
City AliasesIola

06Frequently Asked Questions

What county is ZIP code 77861 in?

ZIP code 77861 is in Grimes County, Texas (county FIPS code 48185).

What city is ZIP code 77861?

The primary USPS city for 77861 is Iola, TX.

What is the population of ZIP code 77861?

The 2020 Census population of 77861 was 2,850 residents.

What is the median income in ZIP code 77861?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 77861 is about $67,105, with around 10% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.