Get API Key →
US ZIP Code Profile

ZIP Code 31329
Springfield, Georgia

ZIP code 31329 is in Springfield, located in Effingham County, Georgia, within the Savannah metro area. Its 2020 Census population was 9,760. The estimated median adjusted gross income per tax return is $48,214, and about 3% of filers report $200,000 or more.

2020 Population
9,760
Census ZCTA
County
Effingham
FIPS 13103
Median income (est.)
$48,214
IRS SOI 2022
Land Area
105.873 mi²
+ 0.252 mi² water

01Location & Geography

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

Primary CitySpringfield, GA
CountyEffingham County (FIPS 13103)
StateGeorgia (FIPS 13)
Metro Area (MSA)Savannah, GA Metro Area (42340)
Census Region / DivisionSouth Region · South Atlantic Division
Coordinates32.42726, -81.350006
Land / Water Area105.873 mi² land · 0.252 mi² water

02Income & Economics

Distribution of the 4,540 individual tax returns filed in 31329 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
27.1%
$25K–$50K
24.7%
$50K–$75K
17.0%
$75K–$100K
11.5%
$100K–$200K
16.7%
$200K+
3.1%
The $200,000+ bracket accounts for 19% of 31329's total adjusted gross income, from 3% of returns — a concentration that drives the gap between the median ($48,214) 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 31329's IRS income metrics, 2020–2022.

Median income (2021→2022)
$48,214
▲ 9.0%
Filers earning $200K+
3.1%
▲ 0.3 pt
Total filers
4,540
▲ 4.1%
GET /zipc/v2/zipcodes/31329/soi?year=… $43K 2020 $44K 2021 $48K 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 31329 ZCTA.

2000
7,082
 
2010
9,034
▲ +27.6%
2020
9,760
▲ +8.0%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number128085
City AliasesSpringfield, Stillwell

06Frequently Asked Questions

What county is ZIP code 31329 in?

ZIP code 31329 is in Effingham County, Georgia (county FIPS code 13103).

What city is ZIP code 31329?

The primary USPS city for 31329 is Springfield, GA.

What metro area (MSA) is 31329 in?

31329 is part of the Savannah, GA Metro Area (MSA code 42340).

What is the population of ZIP code 31329?

The 2020 Census population of 31329 was 9,760 residents.

What is the median income in ZIP code 31329?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 31329 is about $48,214, with around 3% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.