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US ZIP Code Profile

ZIP Code 31811
Hamilton, Georgia

ZIP code 31811 is in Hamilton, located in Harris County, Georgia, within the Columbus metro area. Its 2020 Census population was 6,274. The estimated median adjusted gross income per tax return is $56,985, and about 8% of filers report $200,000 or more.

2020 Population
6,274
Census ZCTA
County
Harris
FIPS 13145
Median income (est.)
$56,985
IRS SOI 2022
Land Area
130.615 mi²
+ 4.53 mi² water

01Location & Geography

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

Primary CityHamilton, GA
CountyHarris County (FIPS 13145)
StateGeorgia (FIPS 13)
Metro Area (MSA)Columbus, GA-AL Metro Area (17980)
Census Region / DivisionSouth Region · South Atlantic Division
Coordinates32.737354, -84.93744
Land / Water Area130.615 mi² land · 4.53 mi² water

02Income & Economics

Distribution of the 2,650 individual tax returns filed in 31811 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
25.3%
$25K–$50K
21.1%
$50K–$75K
12.8%
$75K–$100K
11.3%
$100K–$200K
21.1%
$200K+
8.3%
The $200,000+ bracket accounts for 38% of 31811's total adjusted gross income, from 8% of returns — a concentration that drives the gap between the median ($56,985) 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 31811's IRS income metrics, 2020–2022.

Median income (2021→2022)
$56,985
▲ 5.2%
Filers earning $200K+
8.3%
▲ 0.2 pt
Total filers
2,650
▲ 1.9%
GET /zipc/v2/zipcodes/31811/soi?year=… $50K 2020 $54K 2021 $57K 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 31811 ZCTA.

2000
3,912
 
2010
5,103
▲ +30.4%
2020
6,274
▲ +22.9%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number123960
City AliasesHamilton

06Frequently Asked Questions

What county is ZIP code 31811 in?

ZIP code 31811 is in Harris County, Georgia (county FIPS code 13145).

What city is ZIP code 31811?

The primary USPS city for 31811 is Hamilton, GA.

What metro area (MSA) is 31811 in?

31811 is part of the Columbus, GA-AL Metro Area (MSA code 17980).

What is the population of ZIP code 31811?

The 2020 Census population of 31811 was 6,274 residents.

What is the median income in ZIP code 31811?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 31811 is about $56,985, 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.