Census Data

This layer represents the boundaries of 2020 Census Blocks in Hamilton County.

Census blocks are:
The smallest geographic area for which the Bureau of the Census collects and tabulates decennial census data.
Statistical areas bounded by visible features such as roads, streams, and railroad tracks, and by nonvisible boundaries such as property lines, city, township, school district, county limits and short line-of-sight extensions of roads.
The building blocks for all geographic boundaries the Census Bureau tabulates data for, such as tracts, places, and American Indian Reservations.
Generally small in area. In a city, a census block looks like a city block bounded on all sides by streets. Census blocks in suburban and rural areas may be large, irregular, and bounded by a variety of features, such as roads, streams, and transmission lines. In remote areas, census blocks may encompass hundreds of square miles.
Numbered uniquely with a four-digit census block number ranging from 0000 to 9999 nesting within each census tract, which nest within state and county. The first digit of the census block number identifies the block group. Block numbers beginning with a zero (in Block Group 0) are associated with water-only areas.
Delineated by the U.S. Census Bureau once every ten years. An automated computer process looks for all visible and nonvisible features in our geographic database that should be a block boundary and creates a block each time those features create a polygon. The smallest level of geography you can get basic demographic data for, such as total population by age, sex, and race.
Census blocks are not:
Delineated based on population. In fact, many census blocks do not have any population.

Cincinnati SNA Boundary (2020)

The Cincinnati SNA (Statistical Neighborhood Approximations) Boundary layer shows Cincinnati neighborhoods modified to closely "fit" the US Census 2020 Data & 2016-2020 American Community Survey five-year estimates. These boundaries are useful in that they can be correlated to US Census population data. The boundaries are redrawn every ten years following the Census.

Note: The Cincinnati SNA Boundaries are NOT the same as the Cincinnati Community Council Neighborhood Boundaries.

This layer represents the boundaries of the 2020 Census Tracts in Hamilton County.

Census tracts are:
Small, relatively permanent statistical subdivisions of a county.
Uniquely numbered in each county with a numeric code.
About 4,000 inhabitants – Minimum Population – 1,200 – Maximum Population – 8,000.
Designed to be relatively permanent over time. Any changes are documented so data can be compared from decade to decade.

Fiscal Year 2024 Performance Agreements for City of Cincinnati departments and offices.