Census year
0 = 2000
85 = 1850
86 = 1860
87 = 1870
88 = 1880
90 = 1900
91 = 1910
92 = 1920
94 = 1940
95 = 1950
96 = 1960
97 = 1970
98 = 1980
99 = 1990

Census region and division
11 = New England Division
12 = Middle Atlantic Division
13 = Mixed Northeast Divisions (1970 Metro)
21 = East North Central Div.
22 = West North Central Div.
23 = Mixed Midwest Divisions (1970 Metro)
31 = South Atlantic Division
32 = East South Central Div.
33 = West South Central Div.
34 = Mixed Southern Divisions (1970 Metro)
41 = Mountain Division
42 = Pacific Division
43 = Mixed Western Divisions (1970 Metro)
91 = Military/Military reservations
92 = PUMA boundaries cross state lines-1% sample
97 = State not identified
99 = Inter-regional county group (1970 Metro samples)

State (ICPSR code)
96 = State groupings (1980 Urban/rural sample)

Urban/rural status
0 = N/A
1 = Rural
2 = Urban

Group quarters status
0 = Vacant unit
1 = Households with 0 to 4 unrelated persons
2 = Households with 5 to 9 unrelated persons
3 = Group quarters--Institutions
4 = Other group quarters
5 = Households with 10+ unrelated persons
6 = Fragment

Farm status
0 = Unoccupied dwelling (1860-70)
1 = Non-Farm
2 = Farm

Relationship to household head -- Detailed
1260 = Other non-relatives (1990 includes employees)
1283 = Relative of head, staff, or employee group quarters
1294 = Other non-inmate 1980 (includes employees and non-inmates in
1295 = Other non-inmates 1960-1970 (includes employees)

1 = Male
2 = Female

Race -- General
1 = White
2 = Black/Negro
3 = American Indian
4 = Chinese
5 = Japanese
6 = Filipino
7 = Other race, nec
8 = Two or more major races

Marital status
1 = Married, spouse present
2 = Married, spouse absent
3 = Separated
4 = Divorced
5 = Widowed
6 = Never married/single (N/A)

Children surviving
0 = N/A
1 = No children surviving
2 = 1 child
3 = 2 children
4 = 3
5 = 4
6 = 5
7 = 6
8 = 7
9 = 8
10 = 9
11 = 10
12 = 11
13 = 12
14 = 13
15 = 14
16 = 15
17 = 16
19 = 18 children
20 = 19
21 = 20
25 = 24
26 = 25
97 = Unknown
98 = Illegible
99 = Missing

Nativity recode
0 = N/A
1 = Native born, and both parents native born
2 = Native born, and father foreign, mother native
3 = Native born, and mother foreign, father native
4 = Native born, and both parents foreign
5 = Foreign born
9 = Not reported

Speaks English
0 = N/A (Blank)
1 = Does not speak English
2 = Yes, speaks English...
3 = Yes, speaks only English
4 = Yes, speaks very well
5 = Yes, speaks well
6 = Yes, but not well
7 = Unknown
8 = Illegible
9 = Blank

School attendance
0 = N/A
1 = No, not in school
2 = Yes, in school

Literacy
0 = N/A
1 = No, illiterate (cannot read or write)
2 = Cannot read, can write
3 = Cannot write, can read
4 = Yes, literate (reads and writes)
9 = Unknown, illegible or blank

Labor force status
0 = N/A
1 = No, not in the labor force
2 = Yes, in the labor force

Occupation, 1950 basis
17 = Geology and geophysics-Professors and instructors
26 = Natural science (nec)-Professors and instructors
27 = Social sciences (nec)-Professors and instructors
29 = Subject not specified-Professors and instructors
79 = Social and welfare workers, except group
99 = Professional, technical & kindred workers (nec)
240 = Officers, pilots, pursers and engineers, ship
250 = Officials & administratators (nec), public administration
290 = Managers, officials, and proprietors (nec)
302 = Attendants, physicians and dentists office
325 = Express messengers and railway mail clerks
522 = Excavating, grading, and road machinery operators
532 = Inspectors, scalers, and graders log and lumber
534 = Jewelers, watchmakers, goldsmiths, and silversmiths
540 = Linemen and servicemen, telegraph, telephone, & power
552 = Radio and television-mechanics and repairmen
553 = Railroad and car shop-mechanics and repairmen
563 = Opticians and lens grinders and polishers
582 = Shoemakers and repairers, except factory
591 = Tinsmiths, coppersmiths, and sheet metal workers
633 = Dressmakers and seamstresses except factory
640 = Fruit, nut, and vegetable graders, and packers, except facto
644 = Meat cutters, except slaughter and packing house
660 = Motormen, mine, factory, logging camp, etc
661 = Motormen, street, subway, and elevated railway
670 = Painters, except construction or maintenance
730 = Attendants, hospital and other institution
731 = Attendants, professional and personal service (nec)
764 = Housekeepers and stewards, except private household
790 = Service workers, except private household (nec)
920 = Garage laborers and car washers and greasers
930 = Gardeners, except farm, and groundskeepers