County outline
Where La Paz County is located
Area breakdown
Land accounts for 99.7% of La Paz County’s measured area and water for 0.3%. Its combined area converts to 11,682.6 square kilometers or approximately 2,886,833 acres.
Green: land · blue: water
| Measurement | Square miles | Square kilometers | Acres |
|---|---|---|---|
| Land | 4,496.579 | 11,646.086 | 2,877,810.6 |
| Water | 14.098 | 36.514 | 9,022.7 |
| Total | 4,510.677 | 11,682.6 | 2,886,833.3 |
How La Paz County compares
By original Census land area, La Paz County ranks #13 of 15 in Arizona and #101 of 3,222 nationally. National rankings include the 50 states, District of Columbia, and Puerto Rico.
Its land area is 0.724 times the Arizona county-equivalent median of 6,209.9 square miles. It accounts for 4% of the combined county land area in the state.
See the complete Arizona ranking · What counts as a county equivalent?
Population and density of La Paz County
The Census Bureau estimates that 16,711 people lived in La Paz County on July 1, 2025. That ranks #2,057 of 3,222 county equivalents nationally and #14 of 15 in Arizona. Since the April 1, 2020 estimates base of 16,554, the population has grown by 157 (+0.9%), compared with +6.5% for Arizona as a whole.
With 4,496.6 square miles of land, that is 3.7 people per square mile (1.4 per km²), placing La Paz County #2,930 nationally for density and #15 in Arizona. The median county equivalent has 47 people per square mile; the Arizona median is 17. Put another way, there are about 172 acres of land per resident.
| July 1 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|
| Estimate | 16,562 | 16,358 | 16,460 | 16,615 | 16,670 | 16,711 |
| Change | — | −204 | +102 | +155 | +55 | +41 |
U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.
Cities and towns in La Paz County
2 incorporated places lie at least partly in La Paz County. Together they are home to 5,782 people (34.6%); the other 10,929 (65.4%) live outside any incorporated place, in unincorporated communities and rural areas.
The largest is Parker town, with 3,394 residents in the county. By land, Quartzsite town is the largest at 36.3 mi².
| Incorporated place | Population 2025 | Since 2020 | Land mi² |
|---|---|---|---|
| Parker townCounty seat | 3,394 | −0.6% | 22 |
| Quartzsite town | 2,388 | −1% | 36.3 |
Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each place inside La Paz County. Land: 2026 Census Gazetteer, for the whole place even where it extends into other counties. How communities are listed.
Metropolitan area
La Paz County is not part of any metropolitan or micropolitan statistical area in the Office of Management and Budget’s July 2023 delineation; 1,306 other county equivalents are also outside one. These areas are built around an urban core of at least 10,000 people plus the counties tied to it by commuting, so counties outside them are generally rural.
ZIP codes
8 ZIP Code Tabulation Areas have land in La Paz County, and each lies mostly inside the county.
8532585328853348534485346853488535785371
ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Post-office-box and single-address ZIP Codes have no tabulation area.
Counties bordering La Paz County
La Paz County shares a land border with 7 county equivalents, including 3 in California. It has more land than 1 of them. The largest neighbor is San Bernardino County (20,068.4 mi²) and the smallest is Imperial County (4,175.5 mi²). Together with its neighbors, La Paz County forms a block of 72,120.4 mi² of land, of which it holds 6.2%.
| Bordering county equivalent | Land mi² | Size vs. La Paz | Compare |
|---|---|---|---|
| San Bernardino CountyCalifornia | 20,068.4 | 4.5× larger | Compare |
| Mohave County | 13,332.1 | 3× larger | Compare |
| Maricopa County | 9,202 | 2× larger | Compare |
| Yavapai County | 8,122.9 | 1.8× larger | Compare |
| Riverside CountyCalifornia | 7,209 | 1.6× larger | Compare |
| Yuma County | 5,513.8 | 1.2× larger | Compare |
| Imperial CountyCalifornia | 4,175.5 | 1.1× smaller | Compare |
How big is La Paz County compared with U.S. states?
La Paz County has more land than 2 of the 50 states. It is about 2.3 times the land area of Delaware (1,948.6 mi²), while Connecticut, the next larger state, has 1.1 times as much land (4,842.5 mi²). Arizona’s county land could hold about 25 areas the size of La Paz County.
Another way to picture it: the same land area would fill a square about 67.1 miles (107.9 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.
State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.
What stands out about La Paz County?
La Paz County has more land than 3,121 of the other 3,221 county equivalents in the dataset.
A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.
Does including water change its rank?
Using land plus water places La Paz County at #109 nationally by total area, 8 places farther from the top than its land rank. Other county equivalents gain more area when their water measurements are included.
Its water share is 0.3%, compared with a national county-equivalent median of 1.2% — 0.9 percentage points lower. This describes the statistical geography’s land/water mix, not flood exposure or developable land.
Closest positions in the national land ranking
These entries sit immediately beside La Paz County in the national ranking. They can be in different states and are not necessarily geographic neighbors.
| Land rank | County equivalent | Land mi² | Comparison |
|---|---|---|---|
| #100 | Grant County, Oregon | 4,527.8 | Compare |
| #101 | La Paz County, Arizona | 4,496.6 | This county |
| #102 | Uintah County, Utah | 4,482.9 | Compare |
Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.
Representative coordinates
The Census internal point is 33.727610, -114.038806. It represents a location inside the geography; it is not necessarily the centroid or the address of a courthouse.
Source and precision
U.S. Census Bureau, 2026 Gazetteer Files, Counties. Original ALAND: 11,646,086,533 m²; AWATER: 36,514,335 m². Rankings use ALAND; exact ties use ascending GEOID. Tables preserve Census-published square miles to three decimals, with conversions based on those values.
Common questions
How big is La Paz County?
La Paz County, Arizona has 4,496.6 square miles (11,646.1 km²) of land and 14.1 square miles of water, for a total area of 4,510.7 square miles. It ranks #101 of 3,222 U.S. county equivalents by land area.
Is La Paz County the largest county in Arizona?
No. La Paz County ranks #13 of 15 in Arizona by land area. The largest is Coconino County, with 18,616.4 square miles of land.
What counties border La Paz County?
La Paz County shares a land border with Yuma County, Mohave County, Riverside County, California, Maricopa County, Imperial County, California, San Bernardino County, California, and Yavapai County.
What is the population of La Paz County?
The Census Bureau estimates La Paz County had 16,711 residents on July 1, 2025, ranking #2,057 of 3,222 county equivalents. That is 3.7 people per square mile of land.
What is the county seat of La Paz County?
The county seat of La Paz County is Parker.
What cities and towns are in La Paz County?
La Paz County has 2 incorporated places. The most populous are Parker town and Quartzsite town; 10,929 residents live outside any incorporated place.
Is La Paz County part of a metropolitan area?
No. La Paz County is outside every metropolitan and micropolitan statistical area in the July 2023 OMB delineation.
How many ZIP codes are in La Paz County?
8 ZIP Code Tabulation Areas have land in La Paz County, and 8 of them have most of their land inside the county. Census ZIP Code Tabulation Areas approximate USPS ZIP Code areas.
How does La Paz County compare with U.S. states?
It has more land than 2 of the 50 states, including Delaware (1,948.6 square miles of land).
How many acres of land are in La Paz County?
The land measurement converts to approximately 2,877,811 acres. Including water, total area is approximately 2,886,833 acres. One square mile equals 640 acres.
Why might another source show a different area?
Check whether it reports land or total area, its Census vintage, and its rounding. Our guide explains how to reconcile county area figures.
Can this establish a property boundary?
No. Statistical measurements and generalized maps do not establish property lines. Consult the relevant local surveying or land-records authority.