CENTERS FOR DISEASE CONTROL AND PREVENTION (CDC)
National Center for Environmental Health (NCEH)
Childhood Lead Poisoning
Prevention Program
Introduction | Data source | Download data files | Database query | Help with database query
First select a State you are interested in. In this version, you can only perform queries on one state at a time.
Select the basic geographic area unit for which you would like to see data.
Each record in this file contains data for a single County within a State. The following table contains the first four records returned for a query on the County file for Georgia:
| State | County | Total Housing Units | Number Houses Built Before 1950 | Percent Houses Built Before 1950 |
| Georgia | Appling | 6,629 | 1,223 | 18.4 |
| Georgia | Atkinson | 2,449 | 457 | 18.7 |
| Georgia | Bacon | 3,859 | 666 | 17.3 |
| Georgia | Baker | 1,499 | 224 | 14.9 |
Each record in this file contains data for a single 1990 ZIP Code within a State. Keep in mind that there were fewer ZIP Codes in 1990, and the ZIP Code areas are not the same as the those today.
The following table contains the first four records returned for a query on the ZIP Code file for Georgia:
| State | ZIP Code | Total Housing Units | Number Houses Built Before 1950 | Percent Houses Built Before 1950 |
| Georgia | 30001 | 10,925 | 789 | 7.2 |
| Georgia | 30002 | 2,202 | 474 | 21.5 |
| Georgia | 30021 | 8,579 | 525 | 6.1 |
| Georgia | 30027 | 2,407 | 141 | 5.9 |
Each record within this file contains data for an area within BOTH a 1990 ZIP Code and a County. Typically, a County includes areas from one or more Zip Codes. For example, Butts County, Georgia includes areas from Zip Codes 30216, 30233, 30234 and 30257:
| State | County | Zip Code | Total Housing Units | Number Houses Built Before 1950 | Percent Houses Built Before 1950 |
| Georgia | Butts | 30216 | 743 | 159 | 21.4 |
| Georgia | Butts | 30233 | 4,377 | 685 | 15.6 |
| Georgia | Butts | 30234 | 416 | 69 | 16.6 |
| Georgia | Butts | 30257 | 0 | 0 |
There are no houses in the portion of the Zip Code 30257 in Butts County. Other areas of Zip Code 30257, however, are within Lamar and Pike counties:
| State | County | Zip Code | Total Housing Units | Number Houses Built Before 1950 | Percent Houses Built Before 1950 |
| Georgia | Butts | 30257 | 0 | 0 | |
| Georgia | Lamar | 30257 | 1,422 | 294 | 20.7 |
| Georgia | Pike | 30257 | 62 | 12 | 19.4 |
Each record represents a 1990 Census Tract within the county. A county is divided into Census Tracts. A Census Tract is entirely within a county. Census Tracts are identified by numbers, such as "010010001.00". Some Census Tract numbers (ending with ".99") do not represent real physical areas -- they are used to help enumerate population living on boats and ships.
Each record represents a 1990 Census Tract Block Group within the county. A Census Tract is divided into one or more Block Groups. A Block Group is entirely within a Census Tract.
A query to this database may return hundreds of records (rows in the result table). You may wish to preview a sample of the records and then refine your query. Enter the maximum number of returned records in the "Show TOP Records" text box (default is 20 records returned).
If the "Show Maps" check box is checked, then one or more maps will may be displayed automatically with each query.
If the "Show More Data" check box is checked, then additional columns entitled "More Data" will appear as the leftmost and rightmost columns in the results. You can click on those links to see more detailed maps of the geographic area and all the information in the database for this area.
If the "Show Fields" check box is checked, then the list of data fields are shown after the query results. You can select the fields to include or exclude for the next query by checking or unchecking the boxes for each of the fields.
You can specify a range of values for numeric fields. The first entry is the minimum value and the second entry is the maximum value for that field. For example, if you enter "1000" and "2000" for the range in "Total Population" then the query results will only include geographic areas with at least 1000 but no more than 2000 people. If you want areas with at least 1000 people (but no upper bound) then enter "1000" as the first entry and leave the second entry blank. Similarly, if you want areas with at most 2000 people (but no lower bound) then enter "2000" as the second entry. You can specify the range values for any number of fields that are shown.
Most fields shown include an option to to select that field to be sorted. You can also select the sort order as ascending ("Lo..Hi") or descending (Hi..Lo). When you submit the query again, the results will be sorted on this field. Only one field can be sorted for each query. The field column that is sorted will be shown with a highlighted color. State and county fields may be sorted automatically on some queries. When this happens, these fields are also shown with highlighted color.
Click the "Submit" button to send the request to the Web server. Click the "Reset" button to undo changes you have made.
The maps show the geographic areas identified in the query result that is returned on the Web page. For example, if the query identified 100 counties but only 20 are returned because of "Show TOP Records" setting, then only these 20 counties are identified on the map.
Maps may not appear with some queries:
Introduction | Data source | Download data files | Database query | Help with database query
Childhood Lead
Poisoning Prevention Program
National Center for Environmental Health (NCEH)
Centers for Disease Control and Prevention (CDC)