|• Total||0.4 sq mi (1.1 km2)|
|• Land||0.4 sq mi (1.1 km2)|
|• Water||0.0 sq mi (0.0 km2)|
|Elevation||584 ft (178 m)|
|• Density||2,196.6/sq mi (848.1/km2)|
|Time zone||Eastern (EST) (UTC-5)|
|• Summer (DST)||EDT (UTC-4)|
|GNIS feature ID||0499602|
As of the census of 2000, there were 970 people, 367 households, and 252 families residing in the city. The population density was 2,196.6 people per square mile (851.2/km²). There were 421 housing units at an average density of 953.4 per square mile (369.4/km²). The racial makeup of the city was 94.43% White, 4.23% African American, 1.24% Asian, and 0.10% from two or more races. Hispanic or Latino of any race were 0.82% of the population.
There were 367 households out of which 27.2% had children under the age of 18 living with them, 62.4% were married couples living together, 5.2% had a female householder with no husband present, and 31.3% were non-families. 27.0% of all households were made up of individuals and 9.8% had someone living alone who was 65 years of age or older. The average household size was 2.32 and the average family size was 2.85.
In the city the population was spread out with 19.8% under the age of 18, 3.9% from 18 to 24, 22.1% from 25 to 44, 26.3% from 45 to 64, and 27.9% who were 65 years of age or older. The median age was 49 years. For every 100 females there were 81.6 males. For every 100 females age 18 and over, there were 82.6 males.
The median income for a household in the city was $83,752, and the median income for a family was $105,620. Males had a median income of $82,403 versus $40,000 for females. The per capita income for the city was $41,490. None of the families and 1.5% of the population were living below the poverty line, including no under eighteens and 3.0% of those over 64.
1974 Tornado damage
Northfield was one of the hardest hit neighborhoods when Louisville was hit by an F4 tornado on April 3, 1974. This tornado was part of the Super Outbreak of 148 tornadoes that hit 13 U.S. states and one Canadian province.
- Commonwealth of Kentucky. Office of the Secretary of State. Land Office. "Northfield, Kentucky". Accessed 15 September 2013.
- "Summary and Reference Guide to House Bill 331 City Classification Reform". Kentucky League of Cities. Retrieved December 30, 2014.
- "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.