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Zip Code 99346 — Plymouth, WA

99346 is a ZIP Code associated with Plymouth, WA, located within Benton. The postal region supports an estimated population of 198 residents across Data Pending housing units, with a population density of 0.5 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (46.026850, -119.306000)

Data Metric	Local Statistic
Postal / Zip Code	99346
Primary City	Plymouth
State / Province	WA
County	Benton
Total Population	198
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	0.5 people/sq mi
Timezone	America/Los_Angeles

How 99346 Compares

Metric	ZIP 99346	Benton County	WA State Average
Population	198	234,788	7,816,021
Median Income	Data Pending	N/A	N/A
Population Density	0.5 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 99338	Kennewick	10.3 mi	20,633	N/A
Zip 99337	Kennewick	10.6 mi	33,287	N/A
Zip 99336	Kennewick	14.2 mi	50,735	N/A
Zip 99352	Richland	14.9 mi	37,430	N/A
Zip 99345	Paterson	18.1 mi	162	N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →