99128 ZIP Code Profile, Map, Data & Demographics

The ZIP Code maps and database are updated 4 times per year.
Database updated: April 1, 2025, Maps updated: May 1, 2024.

Farmington, WA 99128 Data & Demographics (As of July 1, 2024)

POPULATION
Total Population	351 (100%)
Population in Households	351 (100.0%)
Population in Families	278 (79.2%)
Population in Group Quarters¹	0
Population Density	5
Diversity Index²	23


INCOME
Median Household Income	$71,073
Average Household Income	$87,573
% of Income for Mortgage⁴	23%
Per Capita Income	$36,926
Wealth Index⁵	80
Socioeconomic Status Index⁶	Moderate (56.5)

HOUSING
Total HU (Housing Units)	164 (100%)
Owner Occupied HU	113 (68.9%)
Renter Occupied HU	35 (21.3%)
Vacant Housing Units	16 ( 9.8%)
Median Home Value	$265,625
Average Home Value	$337,168
Housing Affordability Index³	106

HOUSEHOLDS
Total Households	148
Average Household Size	2.37
Family Households	89
Average Family Size	3.00

NOTES

Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different races or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.
The Socioeconomic Index ranges from zero (lowest relative status) to 100 (highest relative status). This measure quantifies disparities in social position of an area's inhabitants and is built from a broad range of demographic, housing, and socioeconomic inputs. More information on this measure can be found in Esri's SEI tutorial.

Farmington, WA 99128 - Peer Comparisons by Rank and Percentile

The table below compares 99128 to the other 586 ZIP Codes in Washington by rank and percentile using July 1, 2024 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

GROWTH RATE / YEAR	2020-2024	2024-2029
Population	1.98%	0.84%
Households	0.65%	0.40%
Families		0.22%
Median Household Income		2.13%
Per Capita Income		3.77%
Owner Occupied HU		1.71%

Variable Description	Rank	Percentile
Total Population	# 511	13th
Population Density	# 516	12th
Median Household Income	# 384	35th
Housing Affordability Index	# 557	95th
Per Capita Income	# 385	34th
Diversity Index	# 558	5th

99128 ZIP Code Profile, Map, Data & Demographics

ZIP Code 99128: Basic Data & USPS Preferred City Name

Farmington, WA 99128 Data & Demographics (As of July 1, 2024)

POPULATION

INCOME

HOUSING

HOUSEHOLDS

GROWTH RATE / YEAR

Farmington, WA 99128 - Peer Comparisons by Rank and Percentile

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