Communicator
Why To Use A County Outline Map
Many government records of genealogical value are kept by county governments, so knowing which county an ancestor lived in, and also which counties are nearby, is an important tool of genealogical research in the United States. Among the county records of importance are:

Marriage Records
These may be either actual records, licenses, or bonds, with the names of the bride and groom, the date of the marriage (or license or bond), and often the names of the parents, marrying official, and witnesses.

Probate Records
Wills and other papers relating to the deceased will usually show the names of family members and give their relationships to the deceased
.
Land and Property Records
Deeds and other records of the transfer, or lease of property, with the names of the seller and buyer, a description of the property, the price of the transaction, and the date.

Court Records
These can range from civil to criminal cases, as well as county business, granting business licenses, and other activities.

Census Schedules
Although not compiled by county governments, the federal censuses (taken every ten years since 1790) were organized by counties. Censuses taken previous to the 1850 census only showed the name of the Head of Household, but beginning in 1850, federal censuses showed every member of the family with his or her age and birthplace.