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US ZIP Code Profile

ZIP Code 31558
Saint Marys, Georgia

ZIP code 31558 is in Saint Marys, located in Camden County, Georgia, within the St. Marys metro area. Its 2020 Census population was 21,348. The estimated median adjusted gross income per tax return is $49,331, and about 5% of filers report $200,000 or more.

2020 Population
21,348
Census ZCTA
County
Camden
FIPS 13039
Median income (est.)
$49,331
IRS SOI 2022
Land Area
75.981 mi²
+ 26.025 mi² water

01Location & Geography

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

Primary CitySaint Marys, GA
CountyCamden County (FIPS 13039)
StateGeorgia (FIPS 13)
Metro Area (MSA)St. Marys, GA Micro Area (41220)
Census Region / DivisionSouth Region · South Atlantic Division
Coordinates30.899385, -81.42751
Land / Water Area75.981 mi² land · 26.025 mi² water

02Income & Economics

Distribution of the 9,250 individual tax returns filed in 31558 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
24.4%
$25K–$50K
26.3%
$50K–$75K
17.2%
$75K–$100K
10.4%
$100K–$200K
17.1%
$200K+
4.7%
The $200,000+ bracket accounts for 22% of 31558's total adjusted gross income, from 5% of returns — a concentration that drives the gap between the median ($49,331) 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 31558's IRS income metrics, 2020–2022.

Median income (2021→2022)
$49,331
▲ 6.2%
Filers earning $200K+
4.7%
▲ 0.3 pt
Total filers
9,250
▼ 2.0%
GET /zipc/v2/zipcodes/31558/soi?year=… $44K 2020 $46K 2021 $49K 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 31558 ZCTA.

2000
20,787
 
2010
20,373
▼ -2.0%
2020
21,348
▲ +4.8%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number127689
City AliasesSaint Marys

06Frequently Asked Questions

What county is ZIP code 31558 in?

ZIP code 31558 is in Camden County, Georgia (county FIPS code 13039).

What city is ZIP code 31558?

The primary USPS city for 31558 is Saint Marys, GA.

What metro area (MSA) is 31558 in?

31558 is part of the St. Marys, GA Micro Area (MSA code 41220).

What is the population of ZIP code 31558?

The 2020 Census population of 31558 was 21,348 residents.

What is the median income in ZIP code 31558?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 31558 is about $49,331, with around 5% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.