The Census Bureau does a good deal of domestic work not normally associated with counting the population.

The Labor Department's monthly employment and unemployment statistics are collected by the Census Bureau in its monthly Current Population Survey, a study of 71,000 homes. The figures are given to Labor to analyze and publish.

The bureau also does health surveys published by the Health and Human Services Department and housing surveys for the Housing and Urban Development Department.

The bureau also performs a service called an "age search" for people who need help proving their age or citizenship. For this, a person fills out a bureau form with the the names of his parents and where they lived at the time of past decennial censuses. Then the bureau checks two censuses and certifies whether the person was listed with those parents at that address and whether a place of birth and birthdate was given. The service costs $12; the forms should be mailed to the bureau, Pittsburg, Kan. 66762.

More than 200,000 people use the service every year to help them qualify for Social Security, citizenship, black lung benefits, welfare, retirement benefits and inheritances. Falsifying the information is punishable by a $10,000 fine, five years in jail, or both.