This layer displays the property boundaries owned by Hamilton County. Information regarding each property can be found on the Hamilton Auditor's County, by entering the owner's name, the parcel ID, or the street address. The auditor's website provides regarding the tax district, the school district, the owner name and address, the land use, the appraisal information, the assessed value, and the property description, amongst other information.This layer doesn't display when zoomed out beyond 1:18,000.

The Auditor Books and Pages layer shows the boundaries of the Hamilton County Auditor's Tax Maps Book and Page. These maps act as an index to show property (parcels) throughout Hamilton County, Ohio. The Book numbers correspond to the villages, cities, and townships in the county and are further subdivided into page numbers for each distinct map. Up until the advent of G.I.S. technology these individual maps were maintained by the Hamilton County Engineer in large books.
Each property in Hamilton County is assigned a parcel number. The first characters of a parcel number reflect the Book and Page to which it belongs.

This layer represents the boundaries of 2010 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.

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.

Countywide Subdivision Boundaries layer displays subdivision/plat boundaries in incorporated and unincorporated territories within Hamilton County. The Subdivision Administration Staff of Hamilton County works with landowners who want to divide their property into multiple lots in unincorporated territories, while plats/subdivisions in incorporated territories are monitored by cities, villages and townships staff. This layer has been last edited on 03/06/2018.