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US ZIP Code Profile

ZIP Code 31328
Tybee Island, Georgia

ZIP code 31328 is in Tybee Island, located in Chatham County, Georgia, within the Savannah metro area. Its 2020 Census population was 3,430. The estimated median adjusted gross income per tax return is $73,864, and about 15% of filers report $200,000 or more.

2020 Population
3,430
Census ZCTA
County
Chatham
FIPS 13051
Median income (est.)
$73,864
IRS SOI 2022
Land Area
5.555 mi²
+ 0.824 mi² water

01Location & Geography

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

Primary CityTybee Island, GA
CountyChatham County (FIPS 13051)
StateGeorgia (FIPS 13)
Metro Area (MSA)Savannah, GA Metro Area (42340)
Census Region / DivisionSouth Region · South Atlantic Division
Coordinates32.011177, -80.86558
Land / Water Area5.555 mi² land · 0.824 mi² water

02Income & Economics

Distribution of the 1,620 individual tax returns filed in 31328 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
20.4%
$25K–$50K
16.7%
$50K–$75K
13.6%
$75K–$100K
11.1%
$100K–$200K
23.5%
$200K+
14.8%
The $200,000+ bracket accounts for 56% of 31328's total adjusted gross income, from 15% of returns — a concentration that drives the gap between the median ($73,864) 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 31328's IRS income metrics, 2020–2022.

Median income (2021→2022)
$73,864
▲ 1.7%
Filers earning $200K+
14.8%
▼ 0.5 pt
Total filers
1,620
▼ 4.7%
GET /zipc/v2/zipcodes/31328/soi?year=… $61K 2020 $73K 2021 $74K 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 31328 ZCTA.

2000
3,713
 
2010
3,306
▼ -11.0%
2020
3,430
▲ +3.8%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number128920
City AliasesFort Screven, Tybee Island

06Frequently Asked Questions

What county is ZIP code 31328 in?

ZIP code 31328 is in Chatham County, Georgia (county FIPS code 13051).

What city is ZIP code 31328?

The primary USPS city for 31328 is Tybee Island, GA.

What metro area (MSA) is 31328 in?

31328 is part of the Savannah, GA Metro Area (MSA code 42340).

What is the population of ZIP code 31328?

The 2020 Census population of 31328 was 3,430 residents.

What is the median income in ZIP code 31328?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 31328 is about $73,864, with around 15% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.