Cost of Living: Seattle, WA vs Thornton, CO (2026)

Seattle

Washington
196
VS

Thornton

Colorado
138

Seattle is 42% more expensive than Thornton.

$1,998/mo ↑ 10%
Median Rent
$1,810/mo ↓ 9%
$121,984/yr ↑ 21%
Median Income
$100,985/yr ↓ 17%
$912,100 ↑ 89%
Home Value
$482,200 ↓ 47%
$2,220/mo ↑ 16%
Owner Costs
$1,914/mo ↓ 14%
741,440
Population
142,878

Tax Comparison

0%
Income Tax
4.4%
6.5%
State Sales Tax
2.9%
0.92%
Property Tax
0.51%

Affordability

19.7%
rent-to-income
Affordability
21.5%
rent-to-income

Detailed Comparison

When comparing Seattle, WA and Thornton, CO, the overall cost of living indices are 196 and 138 respectively (national median = 100). Rent is $188/month cheaper in Thornton, saving renters about $2,256/year.

Median household income is $20,999/year higher in Seattle. Home values also differ significantly — the median in Seattle is $912,100 compared to $482,200 in Thornton.

Washington has no state income tax, giving Seattle residents a significant tax advantage over Colorado's 4.4% rate.

Frequently Asked Questions

Seattle vs Thornton — common questions

Is Seattle or Thornton cheaper to live in?
Based on our cost index, Thornton is cheaper to live in with an index of 138 compared to 196 (US average = 100).
What is the rent difference between Seattle and Thornton?
Median rent in Seattle is $1,998/month and in Thornton it's $1,810/month — a difference of $188/month.
Which city has higher income, Seattle or Thornton?
Median household income is $121,984 in Seattle and $100,985 in Thornton. Median household income is $20,999/year higher in Seattle.
How do taxes compare between Washington and Colorado?
Washington has 0% income tax, 6.5% sales tax, and 0.92% property tax. Colorado has 4.4% income tax, 2.9% sales tax, and 0.51% property tax.
Should I move to Seattle or Thornton?
It depends on your priorities. Seattle has a cost index of 196 with median rent of $1,998/mo, while Thornton has a cost index of 138 with rent of $1,810/mo. Consider income potential, tax burden, and lifestyle preferences alongside raw cost data.
View Seattle details → View Thornton details →

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