Petersburg County Demographics

A map of Petersburg County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	2,096	2,444	61.5%	71.9%
Asian	424	117	12.4%	3.4%
Hispanic	371	164	10.9%	4.8%
Multiracial	287	363	8.4%	10.7%
Native American/Other	186	264	5.5%	7.8%
Black	45	46	1.3%	1.4%

Petersburg County, Alaska has an estimated population of 3,409, a less than 1% change from the 3,398 recorded in the 2020 Census. The population is 61.5% White, 12.4% Asian, 10.9% Hispanic, 8.4% Multiracial, 5.5% Native American/Other, and 1.3% Black. This demographic dot map shows the population of Petersburg County, with one dot drawn for each person counted by the Census, color-coded by race.

Petersburg has become considerably more racially diverse since the 2020 Census. It is less diverse than Alaska overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Petersburg County, that probability was 46.2% in 2020 and 58.4% in the most recent ACS estimates.

Petersburg County is ranked the 21st most populous county in Alaska, out of 30 counties. Petersburg County was ranked the 21st most populous county in the 2020 Census.

Petersburg County's White Population

2,096 residents of Petersburg County, or 61.5% of the population, identify as White. The share of White residents in Petersburg County is slightly higher than in Alaska overall, where 57.7% of the population is White. Petersburg County ranks 7th statewide in terms of White residents as a share of the population, out of 30 counties.

Since the 2020 Census, Petersburg County's White population has declined by an estimated 14.2%. White residents' share of Petersburg County's population has decreased from 71.9% to 61.5%.

Petersburg County is more White than neighboring Wrangell City and County (56.4% White), Prince of Wales-Hyder Census Area County (43.6% White), Juneau City and County (61.4% White), Sitka City and County (57.6% White), and Ketchikan Gateway County (60.4% White).

Petersburg County's Black Population

45 residents of Petersburg County, or 1.3% of the population, identify as Black. The share of Black residents in Petersburg County is comparable to the share in Alaska overall, where 2.9% of the population is Black. Petersburg County ranks 6th statewide in terms of Black residents as a share of the population, out of 30 counties.

Since the 2020 Census, Petersburg County's Black population has declined by an estimated 2.2%. Black residents' share of Petersburg County's population has remained roughly unchanged at 1.3%.

Petersburg County is more Black than neighboring Wrangell City and County (0.1% Black), Prince of Wales-Hyder Census Area County (0.2% Black), Juneau City and County (0.6% Black), Sitka City and County (0.3% Black), and Ketchikan Gateway County (0.5% Black).

Petersburg County's Asian Population

424 residents of Petersburg County, or 12.4% of the population, identify as Asian. The share of Asian residents in Petersburg County is higher than in Alaska overall, where 6.4% of the population is Asian. Petersburg County ranks 11th statewide in terms of Asian residents as a share of the population, out of 30 counties.

Since the 2020 Census, Petersburg County's Asian population has grown by an estimated 262.4%. Asian residents' share of Petersburg County's population has increased from 3.4% to 12.4%.

Petersburg County is more Asian than neighboring Wrangell City and County (4.2% Asian), Prince of Wales-Hyder Census Area County (2.2% Asian), Juneau City and County (7.2% Asian), Sitka City and County (8.3% Asian), and Ketchikan Gateway County (8.9% Asian).

Petersburg County's Hispanic Population

371 residents of Petersburg County, or 10.9% of the population, identify as Hispanic. The share of Hispanic residents in Petersburg County is slightly higher than in Alaska overall, where 7.3% of the population is Hispanic. Petersburg County ranks 14th statewide in terms of Hispanic residents as a share of the population, out of 30 counties.

Since the 2020 Census, Petersburg County's Hispanic population has grown by an estimated 126.2%. Hispanic residents' share of Petersburg County's population has increased from 4.8% to 10.9%.

Petersburg County is more Hispanic than neighboring Wrangell City and County (3.8% Hispanic), Prince of Wales-Hyder Census Area County (3.8% Hispanic), Juneau City and County (7.1% Hispanic), Sitka City and County (6.9% Hispanic), and Ketchikan Gateway County (5.4% Hispanic).

Petersburg County's Native American/Other Population

186 residents of Petersburg County, or 5.5% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Petersburg County is lower than in Alaska overall, where 15.5% of the population is Native American/Other. Petersburg County ranks 27th statewide in terms of Native American/Other residents as a share of the population, out of 30 counties.

Since the 2020 Census, Petersburg County's Native American/Other population has declined by an estimated 29.5%. Native American/Other residents' share of Petersburg County's population has decreased from 7.8% to 5.5%.

Petersburg County is less Native American/Other than neighboring Wrangell City and County (18.6% Native American/Other), Prince of Wales-Hyder Census Area County (37% Native American/Other), Juneau City and County (10.2% Native American/Other), Sitka City and County (10.3% Native American/Other), and Ketchikan Gateway County (12.8% Native American/Other).

Petersburg County's Multiracial Population

287 residents of Petersburg County, or 8.4% of the population, identify as Multiracial. The share of Multiracial residents in Petersburg County is comparable to the share in Alaska overall, where 10.3% of the population is Multiracial. Petersburg County ranks 7th statewide in terms of Multiracial residents as a share of the population, out of 30 counties.

Since the 2020 Census, Petersburg County's Multiracial population has declined by an estimated 20.9%. Multiracial residents' share of Petersburg County's population has decreased from 10.7% to 8.4%.

Petersburg County is less Multiracial than neighboring Wrangell City and County (16.9% Multiracial), Prince of Wales-Hyder Census Area County (13.2% Multiracial), Juneau City and County (13.6% Multiracial), Sitka City and County (16.5% Multiracial), and Ketchikan Gateway County (12.1% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.