| 2000 Census | 2010 Census | 2020 Census | 2023 Estimate | |
| Kennewick-Pasco-Richland MSA | 191,822 | 253,340 | 303,622 | 316,600 | 
| Benton County | 142,475 | 175,177 | 206,873 | 215,500 | 
| Kennewick | 54,751 | 73,917 | 83,921 | 86,470 | 
| Richland | 38,708 | 48,058 | 60,560 | 63,320 | 
| West Richland | 8,385 | 11,811 | 16,295 | 17,840 | 
| Prosser | 4,838 | 5,714 | 6,062 | 6,445 | 
| Franklin County | 49,347 | 78,163 | 96,749 | 101,100 | 
| Pasco | 32,066 | 59,781 | 77,108 | 81,280 | 
| Connell | 2,956 | 4,209 | 5,441 | 4,960 | 
| Source: April 1 Official Population Estimates Released on June 29, 2023, Office of Financial Management | ||||
| 2000 Census | 2010 Census | 2020 Census | 2022 Estimate | |
| Male | 49.9% | 50.3% | 50.7% | 50.6% | 
| Female | 50.1% | 49.7% | 49.3% | 49.4% | 
| Source: Office of Financial Management | ||||
| 2010 Census | 2020 Census | 2022 Estimate | |
| White | 65.0% | 57.2% | 56.0% | 
| Black | 1.3% | 1.4% | 1.5% | 
| American Indian or Alaska Native | 0.7% | 0.5% | 0.6% | 
| Asian | 2.5% | 2.7% | 2.8% | 
| Native Hawaiian or Other Pacific Islander | 0.1% | 0.2% | 0.3% | 
| Two or More Races | 1.8% | 4.2% | 4.1% | 
| Hispanic or Latino | 28.7% | 33.8% | 34.8% | 
| Non-Hispanic or Latino | 71.3% | 66.2% | 65.2% | 
| Source: Office of Financial Management | |||
| 2010 Census | 2020 Census | 2022 Estimate | |
| 0 – 4 | 8.4% | 7.4% | 6.9% | 
| 5 – 9 | 8.2% | 8.1% | 7.8% | 
| 10 – 19 | 15.5% | 15.4% | 15.5% | 
| 20 – 29 | 13.8% | 13.0% | 13.0% | 
| 30 – 39 | 13.2% | 13.6% | 13.7% | 
| 40 – 49 | 12.8% | 12.0% | 12.2% | 
| 50 – 59 | 12.7% | 11.3% | 11.0% | 
| 60 – 64 | 4.9% | 5.5% | 5.5% | 
| 65+ | 10.4% | 13.8% | 14.5% | 
| Source: Office of Financial Management | |||
| 2000 Census | 2010 Census | 2020 Census | 2022 Estimate | |
| Total Population | 32.7 | 32.0 | 33.6 | 34.0 | 
| Source: Office of Financial Management | ||||
| 2022 Estimate | |
| < $10K | 3.88% | 
| $10K – $20K | 5.67% | 
| $20K – $30K | 7.00% | 
| $30K – $40K | 7.33% | 
| $40K – $50K | 7.03% | 
| $50K – $60K | 8.59% | 
| $60K – $75K | 10.86% | 
| $75K – $100K | 15.21% | 
| > $100K | 34.43% | 
| Source: www.LocateTriCities.com | |
| 2022 Estimate | |
| 1 Person | 21.39% | 
| 2 Person | 33.65% | 
| 3 Person | 16.03% | 
| 4 Person | 14.57% | 
| 5 Person | 8.01% | 
| 6+ Person | 3.91% | 
| Source: www.LocateTriCities.com | |
| Amount | ||
| Median Household Income | $72,538.00 | |
| Average Household Expenditures | $65,625.00 | |
| Source: www.LocateTriCities.com | ||