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US ZIP Code Profile

ZIP Code 32421
Altha, Florida

ZIP code 32421 is in Altha, located in Calhoun County, Florida. Its 2020 Census population was 4,214. The estimated median adjusted gross income per tax return is $40,306, and about 2% of filers report $200,000 or more.

2020 Population
4,214
Census ZCTA
County
Calhoun
FIPS 12013
Median income (est.)
$40,306
IRS SOI 2022
Land Area
137.229 mi²
+ 0.848 mi² water

01Location & Geography

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

Primary CityAltha, FL
CountyCalhoun County (FIPS 12013)
StateFlorida (FIPS 12)
Census Region / DivisionSouth Region · South Atlantic Division
Coordinates30.525356, -85.172775
Land / Water Area137.229 mi² land · 0.848 mi² water

02Income & Economics

Distribution of the 1,720 individual tax returns filed in 32421 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
32.6%
$25K–$50K
28.5%
$50K–$75K
16.9%
$75K–$100K
9.3%
$100K–$200K
11.1%
$200K+
1.7%
The $200,000+ bracket accounts for 9% of 32421's total adjusted gross income, from 2% of returns — a concentration that drives the gap between the median ($40,306) 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 32421's IRS income metrics, 2020–2022.

Median income (2021→2022)
$40,306
▲ 10.8%
Filers earning $200K+
1.7%
▲ 0.0 pt
Total filers
1,720
▼ 0.6%
GET /zipc/v2/zipcodes/32421/soi?year=… $34K 2020 $36K 2021 $40K 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 32421 ZCTA.

2000
3,725
 
2010
4,497
▲ +20.7%
2020
4,214
▼ -6.3%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortC
USPS Finance Number110075
City AliasesAltha

06Frequently Asked Questions

What county is ZIP code 32421 in?

ZIP code 32421 is in Calhoun County, Florida (county FIPS code 12013).

What city is ZIP code 32421?

The primary USPS city for 32421 is Altha, FL.

What is the population of ZIP code 32421?

The 2020 Census population of 32421 was 4,214 residents.

What is the median income in ZIP code 32421?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 32421 is about $40,306, with around 2% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.