PlainZIP

Plymouth, WA · standard

ZIP Code 99346

Benton County, Washington - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

352
1/sq mi
$50,865
Median income
$209,200
Median home value
16.7%
Bachelor's or higher

The verdict

Plymouth pairs one of the lowest household incomes in the country with below-median home values, in a rural, homeowner-dominated area.

15th pct
household income, US ZIPs
46th pct
home value, US ZIPs
1
people per sq mi
95%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 99346 against every reporting US ZIP.

ZIP code 99346 is a sparsely populated ZIP (a standard USPS delivery area) in Plymouth, Benton County, Washington, home to just 352 residents across 320.0 square miles, a density of 1 people per square mile, in the Los Angeles time zone.

ZIP 99346 reports a modest median household income of $50,865 (44% below the Washington average), while per-capita income is $28,424. Local economic indicators show a 8.6% poverty rate alongside 0.0% unemployment. The typical home here is valued at $209,200 (59% below the state average); renters pay a median of - monthly, and 94.7% of units are owner-occupied.

Educational attainment sits below the national norm: 16.7% of adults hold a bachelor's degree or higher, the median age is 55.8, and the average commute is -. Beyond these figures, 3 nearby ZIP codes within about 10 miles are surfaced below, along with 6 more sharing Benton County, letting you compare 99346 to its immediate surroundings rather than a national baseline alone.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 99346, Plymouth, WA · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

352

Population

320.0

Area (sq mi)

1

People / sq mi

Los Angeles

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 99346?

55.8

Median Age

66.7%

Male

33.3%

Female

20.2%

Foreign-Born

White 65.7%
African American 0.0%
Asian 0.0%
American Indian or Alaska Native 2.5%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 6.6%
Hispanic or Latino 33.8%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$50,865

Median Household Income

-44% vs state

$28,424

Per Capita Income

8.6%

Poverty Rate

0.0%

Unemployment Rate

How ZIP 99346 ranks nationally

Plymouth, WA household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$50,865 15th percentile higher than 15% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). This entry sits in this band. $60,000–$80,000: 9,980 US ZIPs (33%). Above this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Above this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Above this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Above this entry. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 64.6%
Bachelor's Degree or Higher 16.7%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

75

Total Housing Units

75

Occupied Units

0

Vacant Units

2.29

Avg Household Size

Occupancy Type

Owner 94.7%
Renter 5.3%

$209,200

Median Home Value

-59% vs state

1998

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What businesses operate in this ZIP?

Census Bureau data shows 7 business establishments in ZIP 99346, employing approximately 114 people with a combined annual payroll of $11,186,000.

7

Businesses

114

Employees

$11.2M

Annual Payroll

1

Industry Sectors

Industry Establishments % of Total
Wholesale trade 3 42.9%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 99346 vs 97882 →

ZIP 99346 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 99346 ranks #4 by population - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 99346 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 99346 ranks #4 of 4 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
97882 Umatilla, OR 7,760 7.2 mi
97838 Hermiston, OR 25,346 10.1 mi
99338 Kennewick, WA 11,555 10.5 mi

More ZIP Codes in Benton County

99336 standard
Kennewick, WA
Pop: 48,753
99337 standard
Kennewick, WA
Pop: 29,845
99352 standard
Richland, WA
Pop: 26,975
99354 standard
Richland, WA
Pop: 21,343
99353 standard
West Richland, WA
Pop: 13,306
99350 standard
Prosser, WA
Pop: 12,979

Related Areas

Benton County Plymouth, WA Washington

Frequently Asked Questions

What county is ZIP code 99346 in? ▼
ZIP code 99346 (Plymouth) is located in Benton County, Washington. Benton County contains multiple ZIP codes, see the full list at /counties/benton-wa.
What is the population of ZIP code 99346? ▼
ZIP code 99346 in Plymouth, WA has a population of 352 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 99346? ▼
The median household income in ZIP 99346 is $50,865, which is 33% below the national average of $76,288.
What is the average home value in ZIP 99346? ▼
The median home value in ZIP 99346 is $209,200, which is 25% below the national average of $278,155.
What is the demographic makeup of ZIP 99346? ▼
The largest racial group in ZIP 99346 is White at 65.7%. Hispanic or Latino residents make up 33.8% of the population.
How many businesses are in ZIP code 99346? ▼
ZIP code 99346 has 7 business establishments employing approximately 114 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What is the education level in ZIP code 99346? ▼
In ZIP code 99346, 64.6% of residents aged 25+ have a high school diploma or higher, and 16.7% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 99346? ▼
In ZIP code 99346, approximately 94.7% of occupied housing units are owner-occupied and 5.3% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 99346? ▼
The poverty rate in ZIP code 99346 is 8.6% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.