| Official Name: | Martinez Lake, Arizona |
| Settlement Type: | CDP |
| Pushpin Map: | USA Arizona#USA |
| Pushpin Label: | Martinez Lake |
| Pushpin Map Caption: | Location within the state of Arizona |
| Subdivision Name: | United States |
| Subdivision Name1: | Arizona |
| Subdivision Type2: | County |
| Subdivision Name2: | Yuma |
| Established Title: | Established |
| Established Date: | 1958[1] |
| Unit Pref: | Imperial |
| Area Footnotes: | [2] |
| Area Total Km2: | 5.79 |
| Area Total Sq Mi: | 2.23 |
| Area Land Km2: | 3.95 |
| Area Land Sq Mi: | 1.52 |
| Area Water Km2: | 1.84 |
| Area Water Sq Mi: | 0.71 |
| Elevation Ft: | 194 |
| Population As Of: | 2020 |
| Population Total: | 94 |
| Population Density Km2: | 23.80 |
| Population Density Sq Mi: | 61.64 |
| Timezone: | MST |
| Utc Offset: | -7 |
| Coordinates: | 32.9864°N -114.4658°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 85365[3] |
| Area Code: | 928 |
| Blank Name: | FIPS code |
| Blank Info: | 04-44830 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2582822 |
Martinez Lake is a census-designated place (CDP) in Yuma County, Arizona, United States, located on Martinez Lake. The population was 798 at the 2010 census. It was founded in 1958 as a fishing community. It remains primarily a vacation community.[4]
Imperial National Wildlife Refuge is located nearby.
As of the 2010 census, there were 798 people living in the CDP: 395 male and 403 female. 258 were 19 years old or younger, 116 were between ages 20–34, 130 were between the ages of 35 and 49, 195 were between 50 and 64, and the remaining 99 were aged 65 and above. The median age was 59.0 years.
The racial makeup of the CDP was 79.1% White, 3.9% Black or African American, 1.9% Asian, 4.1% Other, and 11.0% two or more races. 20.7% of the population were Hispanic or Latino of any race.
There were 313 households in the CDP, 206 family households (65.8%) and 107 non-family households (34.2%), with an average household size of 2.55. Of the family households, 187 were married couples living together, while there were 3 single fathers and 16 single mothers; the non-family households included 100 adults living alone: 63 male and 37 female.
The CDP contained 510 housing units, of which 313 were occupied and 197 were vacant.[5]