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

Group quarters status
0 = Vacant unit
1 = Households under 1970 definition
2 = Additional households under 1990 definition
3 = Group quarters--Institutions
4 = Other group quarters
5 = Additional households under 2000 definition
6 = Fragment

Relationship to household head -- General
1 = Head/Householder
2 = Spouse
3 = Child
4 = Child-in-law
5 = Parent
6 = Parent-in-Law
7 = Sibling
8 = Sibling-in-Law
9 = Grandchild
10 = Other relatives
11 = Partner, friend, visitor
12 = Other non-relatives
13 = Institutional inmates

1 = Male
2 = Female

Race -- General
1 = White
2 = Black/Negro
3 = American Indian
4 = Chinese
5 = Japanese
6 = Other Asian or Pacific Islander
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)

Highest grade of schooling -- General
0 = N/A (or None, 1980)
1 = None
2 = Nursery school
3 = Kindergarten
4 = 1st grade
5 = 2nd grade
6 = 3rd grade
7 = 4th grade
8 = 5th grade
9 = 6th grade
10 = 7th grade
11 = 8th grade
12 = 9th grade
13 = 10th grade
14 = 11th grade
15 = 12th grade
16 = 1st year
17 = 2nd year
18 = 3rd year
19 = 4th year
20 = 5th year or more (40-50)
21 = 6th year or more (60,70)
22 = 7th year
23 = 8th year or more

Educational attainment, 1990
0 = Not applicable
1 = No school completed
2 = Nursery school
3 = Kindergarten
4 = 1st-4th grade
5 = 5th-8th grade
6 = 9th grade
7 = 10th grade
8 = 11th grade
9 = 12th grade, no diploma
10 = High school graduate, or GED
11 = Some college, no degree
12 = Associate degree, occupational program
13 = Associate degree, academic program
14 = Bachelors degree
15 = Masters degree
16 = Professional degree
17 = Doctorate degree

Employment status -- General
0 = N/A
1 = Employed
2 = Unemployed
3 = Not in 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