Mountain Lake, New Jersey should not be confused with Mountain Lakes, New Jersey.
| Mountain Lake, New Jersey | |
| Settlement Type: | Census-designated place |
| Pushpin Map: | USA New Jersey Warren County#USA New Jersey#USA |
| Pushpin Label: | Mountain Lake |
| Pushpin Map Caption: | Location in Warren County##Location in New Jersey##Location in the United States |
| Pushpin Relief: | yes |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Warren |
| Subdivision Type3: | Township |
| Subdivision Name3: | Liberty |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 3.37 |
| Area Land Km2: | 2.92 |
| Area Water Km2: | 0.45 |
| Area Total Sq Mi: | 1.30 |
| Area Land Sq Mi: | 1.13 |
| Area Water Sq Mi: | 0.17 |
| Area Water Percent: | 13.41 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 494 |
| Population Density Km2: | 169.34 |
| Population Density Sq Mi: | 438.72 |
| Timezone: | Eastern (EST) |
| Utc Offset: | −05:00 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | −04:00 |
| Elevation Footnotes: | [3] |
| Elevation M: | 122 |
| Elevation Ft: | 400 |
| Coordinates Footnotes: | [4] [5] |
| Coordinates: | 40.8591°N -74.9882°W |
| Area Code: | 908 |
| Blank Name: | FIPS code |
| Blank Info: | [6] [7] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 02584012[8] |
Mountain Lake is an unincorporated community and census-designated place (CDP)[9] located within Liberty Township in Warren County, in the U.S. state of New Jersey,[10] that was created as part of the 2010 United States Census.[11] [12] [13] As of the 2020 United States census, the CDP's population was 494[2] a decrease of 81 (−14.1%) from the 575 recorded at the 2010 census.[14]
According to the United States Census Bureau, the CDP had a total area of 1.305 square miles (3.381 km2), including 1.130 square miles (2.927 km2) of land and 0.175 square miles (0.453 km2) of water (13.41%).[4]
The 2010 United States census counted 575 people, 261 households, and 154 families in the CDP. The population density was . There were 315 housing units at an average density of . The racial makeup was 95.65% (550) White, 0.52% (3) Black or African American, 0.17% (1) Native American, 1.39% (8) Asian, 0.00% (0) Pacific Islander, 0.87% (5) from other races, and 1.39% (8) from two or more races. Hispanic or Latino of any race were 2.43% (14) of the population.[14]
Of the 261 households, 23.0% had children under the age of 18; 44.8% were married couples living together; 8.8% had a female householder with no husband present and 41.0% were non-families. Of all households, 32.2% were made up of individuals and 11.1% had someone living alone who was 65 years of age or older. The average household size was 2.20 and the average family size was 2.84.[14]
17.7% of the population were under the age of 18, 9.0% from 18 to 24, 22.1% from 25 to 44, 38.1% from 45 to 64, and 13.0% who were 65 years of age or older. The median age was 45.3 years. For every 100 females, the population had 99.7 males. For every 100 females ages 18 and older there were 98.7 males.[14]