Collier County vs Miami-Dade County
Two neighbouring counties in Florida, compared on population, size, income and housing. They share 12 mi of border.
Collier County
Florida
Miami-Dade County
Florida
Both outlines are drawn at true relative size. Collier County spans about 105.9 km at its widest.
Side by side
| Measure | Collier County | Difference | Miami-Dade County |
|---|---|---|---|
| Population | 417,131 | -85.1% | 2,802,029 |
| Change since 2020 | 10.5% | +6.5 pp | 4.0% |
| Land area | 1,997 sq mi | +5.1% | 1,900 sq mi |
| Population density | 209 per sq mi | -85.8% | 1,475 per sq mi |
| Median household income | $90,045 | +25.5% | $71,753 |
| Median home value | $540,700 | +16.8% | $463,000 |
| Median age | 53.3 | +31.0% | 40.7 |
| Households | 165,875 | -83.0% | 975,411 |
| Housing units | 239,406 | -78.1% | 1,094,983 |
Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026; US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. The difference column is computed here: the first county's figure against the second, expressed as a percentage of the second. The change-since-2020 row is the exception: two growth rates differ in percentage points (pp), not percent. Retrieved 30 August 2026.
What the numbers say
- Miami-Dade County holds about 6.7 times the population of Collier County: 2,802,029 against 417,131.
- Collier County covers more ground, at 1,997 square miles against 1,900.
- Miami-Dade County is the more crowded of the two, at 1,475 people per square mile against 209.
- Median household income is higher in Collier County, by 18,292 dollars a year.
- Since 2020, Collier County has grown by 10.5% and Miami-Dade County has grown by 4.0%.
- They share 12 mi of common border, which the Census Bureau publishes in its county adjacency file and which almost no other county reference presents.
Full pages
Want a different pair? Compare any two of the 3,144 US counties.
Rebuilt from source data 30 August 2026. How these figures are produced.