Mount Olive, also spelled Mt. Olive is an unincorporated community and a census-designated place (CDP) in Jefferson County, Alabama. Its location is in the suburbs of Birmingham. As of the 2010 census, the population of the community is 4,079. Mount Olive is bordered on the south and the east by the town of Gardendale, and in fact, some areas that had previously been in Mount Olive have been annexed into Gardendale over the years. Running along part of the border between Mt. Olive and Gardendale is the major expressway, Interstate 65. Eventually, part of Birmingham's Northern Beltline will cut through northwestern sections of Mt. Olive. Mt. Olive has its own elementary school, and was formerly the home of a junior high school.

Mount Olive is located at 33°41′3″N 86°52′31″W / 33.68417°N 86.87528°W / 33.68417; -86.87528 (33.684191, -86.875139).

According to the U.S. Census Bureau, the community has a total area of 9.3 square miles (24.1 km), all land.

Historical population

Census	Pop.	Note	%±
2000	3,957		—
2010	4,079		3.1%
2020	4,427		8.5%
U.S. Decennial Census

Mount Olive racial composition

Race	Num.	Perc.
White (non-Hispanic)	4,029	91.01%
Black or African American (non-Hispanic)	117	2.64%
Native American	12	0.27%
Asian	19	0.43%
Pacific Islander	1	0.02%
Other/Mixed	166	3.75%
Hispanic or Latino	83	1.87%

As of the 2020 United States census, there were 4,427 people, 1,620 households, and 1,280 families residing in the CDP.

At the 2010 census there were 4,079 people, 1,551 households, and 1,217 families residing in the community. The population density was 440 inhabitants per square mile (170/km). There were 1,631 housing units at an average density of 175.4 per square mile (67.7/km). The racial makeup of the community was 97.7% White, 1.0% Black or African American, 0.2% Native American, 0.3% Asian, and .5% from two or more races. 0.5% of the population were Hispanic or Latino of any race. Of the 1,551 households 30.4% had children under the age of 18 living with them, 66.9% were married couples living together, 8.5% had a female householder with no husband present, and 21.5% were non-families. 19.2% of households were one person and 8.5% were one person aged 65 or older. The average household size was 2.63 and the average family size was 3.01.

The age distribution was 22.5% under the age of 18, 7.4% from 18 to 24, 24.6% from 25 to 44, 30.0% from 45 to 64, and 15.5% 65 or older. The median age was 41.7 years. For every 100 females, there were 95.3 males. For every 100 females age 18 and over, there were 98.6 males.

The median household income was $63,942 and the median family income was $81,477. Males had a median income of $51,035 versus $34,426 for females. The per capita income for the community was $28,151. About 4.5% of families and 6.2% of the population were below the poverty line, including 8.5% of those under age 18 and 0.0% of those age 65 or over.

At the 2000 census there were 3,957 people, 1,499 households, and 1,221 families residing in the community. The population density was 417.6 inhabitants per square mile (161.2/km). There were 1,553 housing units at an average density of 163.9 per square mile (63.3/km). The racial makeup of the community was 98.10% White, 0.08% Black or African American, 0.33% Native American, 0.05% Asian, and 1.44% from two or more races. 0.78% of the population were Hispanic or Latino of any race. Of the 1,499 households 34.8% had children under the age of 18 living with them, 72.1% were married couples living together, 6.8% had a female householder with no husband present, and 18.5% were non-families. 16.6% of households were one person and 7.7% were one person aged 65 or older. The average household size was 2.63 and the average family size was 2.95.

The age distribution was 23.5% under the age of 18, 6.5% from 18 to 24, 31.0% from 25 to 44, 25.3% from 45 to 64, and 13.6% 65 or older. The median age was 39 years. For every 100 females, there were 98.3 males. For every 100 females age 18 and over, there were 94.6 males.

The median household income was $48,291 and the median family income was $52,425. Males had a median income of $41,250 versus $27,021 for females. The per capita income for the community was $21,311. About 4.0% of families and 4.6% of the population were below the poverty line, including 1.8% of those under age 18 and 9.0% of those age 65 or over.

33°41′03″N 86°52′31″W / 33.684191°N 86.875139°W / 33.684191; -86.875139