Cities

Cities in Benton County WA range from the large population center of Kennewick to the smaller community of Benton City. This guide provides a clear look at all five incorporated cities in the county, with population figures arranged from largest to smallest. It also explains how the cities compare in size and highlights useful differences for people researching communities, population patterns, relocation options, or places within Benton County.

Benton County Cities by Population

City	Population
Kennewick	89,136
Richland	66,182
West Richland	19,879
Prosser	6,756
Benton City	4,116

Largest Cities in Benton County

Kennewick is the most populous city in Benton County, with an estimated population of 89,136. It stands well ahead of the county's other incorporated cities and accounts for a substantial share of the urban population in the area. For people comparing Benton County communities by population alone, Kennewick is the clear starting point.

Richland is the second-largest city, with 66,182 residents. Although smaller than Kennewick, its population is still significantly greater than that of West Richland, Prosser, or Benton City. Together, Kennewick and Richland form the two largest incorporated population centers within the county.

Mid-Sized Community of West Richland

West Richland has an estimated population of 19,879, placing it third among Benton County cities. Its population is much smaller than Richland's but substantially larger than those of Prosser and Benton City. This makes West Richland a useful middle point when comparing the county's cities by community size.

Population growth has also been notable in West Richland. Its 2020 population was 16,364, meaning the city has added several thousand residents in the years since. Among the five cities, this represents one of the clearest examples of recent population expansion.

Prosser Population and City Size

Prosser ranks fourth in Benton County with an estimated population of 6,756. Its 2020 population was 6,139, showing steady growth while remaining considerably smaller than the three largest cities in the county.

For residents researching smaller incorporated communities, Prosser occupies a distinct position. It has more residents than Benton City but less than half the population of West Richland. This population difference helps distinguish the county's smaller cities from its larger urban centers.

Benton City Population

Benton City is the smallest incorporated city in Benton County by population, with an estimated 4,116 residents. The city had 3,487 residents in 2020, indicating population growth even though it remains the least populous of the county's five cities.

Its smaller population can be useful context for people comparing community size before moving, researching local government areas, or identifying cities within Benton County. Benton City has only a fraction of the population of Kennewick or Richland, creating a noticeably different scale of community.

Population Differences Across the County

The five cities vary considerably in population. Kennewick has more than twenty times the population of Benton City, while Richland has more than three times the population of West Richland. Prosser and Benton City form the county's two smallest incorporated cities, while Kennewick and Richland dominate the upper end of the population range.

These differences make population an important factor when comparing cities in Benton County. Someone looking for a larger city will find Kennewick and Richland at the top of the list, while West Richland offers a smaller population base between the county's largest and smallest communities. Prosser and Benton City provide the lowest population totals among the incorporated cities.