|Yuma County and the state of Arizona|
|• Total||1.9 sq mi (4.9 km2)|
|• Land||1.9 sq mi (4.9 km2)|
|• Water||0.0 sq mi (0.0 km2)|
|Elevation||351 ft (107 m)|
|• Density||292.1/sq mi (113.3/km2)|
|Time zone||MST (no DST) (UTC-7)|
|GNIS feature ID||1759214|
Tacna is located at (32.695927, -113.962997).
According to the United States Census Bureau, the CDP has a total area of 1.9 square miles (4.9 km2), all of it land.
As of the census of 2000, there were 555 people, 194 households, and 149 families residing in the CDP. The population density was 294.3 people per square mile (113.4/km²). There were 281 housing units at an average density of 149.0/sq mi (57.4/km²). The racial makeup of the CDP was 66.67% White, 1.08% Black or African American, 0.72% Native American, 0.54% Asian, 25.41% from other races, and 5.59% from two or more races. 50.81% of the population were Hispanic or Latino of any race.
There were 194 households out of which 37.1% had children under the age of 18 living with them, 66.0% were married couples living together, 7.2% had a female householder with no husband present, and 22.7% were non-families. 18.0% of all households were made up of individuals and 8.8% had someone living alone who was 65 years of age or older. The average household size was 2.86 and the average family size was 3.25.
In the CDP the population was spread out with 30.3% under the age of 18, 7.6% from 18 to 24, 25.9% from 25 to 44, 19.1% from 45 to 64, and 17.1% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 105.6 males. For every 100 females age 18 and over, there were 97.4 males.
The median income for a household in the CDP was $25,556, and the median income for a family was $26,354. Males had a median income of $26,875 versus $23,750 for females. The per capita income for the CDP was $11,197. About 22.4% of families and 25.1% of the population were below the poverty line, including 33.5% of those under age 18 and 14.2% of those age 65 or over.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.