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

Metropolitan status
0 = Not applicable
1 = Not in metro area
2 = In metro area, central city
3 = In metro, area, outside central city
4 = Central city status unknown

Metropolitan area -- Detailed
0 = N/A (household does not reside in a SMA)
8960 = West Palm Beach-Boca Raton-Delray Beach, FL

City -- Detailed
0 = Not in identifiable city (or size group)
4611 = Brooklyn in census years before 1900/Bronx County in 1980, N

Size of place
0 = Not identifiable
1 = Under 1,000, or unincorporated
2 = 1,000 - 2,499
3 = 2,500 - 3,999
4 = 4,000 - 4,999
5 = 5,000 - 9,999
6 = 10,000 - 24,999
7 = 25,000 - 49,999
8 = 50,000 - 74,999
9 = 75,000 - 99,999
10 = 100,000 - 199,999
20 = 200,000 - 299,999
30 = 300,000 - 399,999
40 = 400,000 - 499,999
50 = 500,000 - 599,999
60 = 600,000 - 749,999
70 = 750,000 - 999,999
80 = 1,000,000 - 1,999,999
90 = 2,000,000+

Urbanized area
240 = Allentown-Bethlehem-Easton, Pa.-N.J. (part in Pa. only)
8000 = Springfield-Chicopee-Holyoke, Mass.-Conn. (part in Mass. onl

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

Group quarters type -- Detailed
400 = Institutions for the elderly, handicapped, and poor

Group quarters funding
0 = N/A
11 = Federal support
12 = Federal and State
13 = State support
14 = Local support
15 = State and Local
16 = Government, not specified
21 = Private, Nonprofit
22 = Private, Commercial
23 = Religious
24 = Ethnic, fraternal
25 = Private, unknown
99 = Fragment

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

Farm schedule
0 = N/A
1 = No
2 = Yes, 1 schedule
3 = Yes, 2 schedules
4 = Yes, 3 schedules
5 = Yes, 4 schedules
6 = Yes, 5 schedules

Ownership of dwelling -- Detailed
0 = N/A
10 = Owned or being bought
11 = Check mark (owns?)
12 = Owned free and clear
13 = Owned with mortgage or loan
20 = Rents
21 = No cash rent
22 = With cash rent

Mortgage status
0 = N/A
1 = No, owned free and clear
2 = Check mark (owns?)
3 = Yes, mortgaged/ deed of trust or similar debt
4 = Yes, contract to purchase

Sampling rule
1 = Ordinary dwelling or household
2 = Household sampled from within large unit
3 = Related individuals within a large unit.
4 = Individuals within a large unit.
5 = Fragment.

Verified data record
1 = Unverified data record
2 = Verified data record

Month of enumeration
1 = January
2 = February
3 = March
4 = April
5 = May
6 = June
7 = July
8 = August
9 = September
10 = October
11 = November
12 = December
98 = Illegible
99 = Missing

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)

Imputed relationship to household head
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 -- Detailed
357 = All other specified Am Ind tribe combinations
358 = Other specified Am Ind and Alaska Native tribes
631 = Hawaiian/Asian (1 Asian parent 1 Hawaiian parent)
632 = Hawaiian/European (1 European parent 1 Hawaiian parent)

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

Times married
0 = Not Applicable
1 = Married once
2 = Married twice (or more)
3 = Three times
4 = Four times
5 = Five times
6 = Six times
7 = Unknown
8 = Illegible
9 = Missing

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

Citizenship status
0 = N/A
1 = Born abroad of American parents
2 = Naturalized citizen
3 = Not a citizen
4 = Not a citizen, but has received first papers
5 = Foreign born, citizenship status not reported
7 = Unknown
8 = Illegible
9 = Missing/blank

Years in the United States, intervalled
0 = N/A
1 = 0-5 years
2 = 6-10 years
3 = 11-15 years
4 = 16-20 years
5 = 21+ years
6 = Missing

Mother tongue -- Detailed
3101 = Hindi, Hindustani, Indic, Jaipuri, Pali, Urdu
3510 = Estonian, Ingrian, Livonian, Vepsian, Votic
3520 = Lapp, Inari, Kola, Lule, Pite, Ruija, Skolt, Ume
6322 = Congo, Kongo, Luba, Ruanda, Rundi, Santali, Swahili
7412 = Chasta Costa, Chetco, Coquille, Smith River Athapascan
7450 = Other Athapascan-Eyak, Cahto, Mattole, Wailaki
7630 = Sahaptian, Celilo, Klikitat, Palouse, Tenino, Umatilla, Warm
7714 = Upper Chinook, Clackamas, Multnomah, Wasco, Wishram
9040 = Tewa, Hano, Hopi-Tewa, San Ildefonso, San Juan, Santa Clara
9131 = Tlingit, Chilkat, Sitka, Tongass, Yakutat

Mother tongue of mother -- Detailed
3510 = Estonian, Ingrian, Livonian, Vepsian, Votic

Language spoken -- Detailed
3101 = Hindi, Hindustani, Indic, Jaipuri, Pali, Urdu
3510 = Estonian, Ingrian, Livonian, Vepsian, Votic
3520 = Lapp, Inari, Kola, Lule, Pite, Ruija, Skolt, Ume
7412 = Chasta Costa, Chetco, Coquille, Smith, River Athapascan
7450 = Other Athapascan-Eyak, Cahto, Mattole, Wailaki
7630 = Sahaptian, Celilo, Klikitat, Palouse, Tenino, Umatilla, Warm
7714 = Upper Chinook, Clackamas, Multnomah, Wasco, Wishram
8810 = Sonoran n.e.c., Cahita, Guassave, Huichole, Nayit, Tarahumar
9040 = Tewa, Hano, Hopi-Tewa, San Ildefonso, San Juan, Santa Clara
9131 = Tlingit, Chilkat, Sitka, Tongass, Yakutat
9410 = Other specified American Indian languages

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

Spanish surname
0 = N/A
1 = No, not Spanish surname
2 = Yes, Spanish surname
9 = Not reported

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

Employment status -- Detailed
0 = N/A
10 = At work
11 = At work, public emerg
12 = Has job, not working
13 = Armed forces
14 = Armed forces--at work
15 = Armed forces--not at work but with job
20 = Unemployed
21 = Unemp, exper worker
22 = Unemp, new worker
30 = Not in Labor Force
31 = NILF, housework
32 = NILF, unable to work
33 = NILF, school
34 = NILF, other

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

Industry, 1950 basis
226 = Crude petroleum and natural gas extraction
236 = Nonmettalic mining and quarrying, except fuel
317 = Cement, concrete, gypsum and plaster products
326 = Misc nonmetallic mineral and stone products
336 = Blast furnaces, steel works, & rolling mills
367 = Electrical machinery, equipment and supplies
376 = Motor vehicles and motor vehicle equipment
379 = Railroad and misc transportation equipment
388 = Watches, clocks, and clockwork-operated devices
408 = Canning and preserving fruits, vegetables, and seafoods
419 = Misc food preparations and kindred products
437 = Dyeing and finishing textiles, except knit goods
438 = Carpets, rugs, and other floor coverings
459 = Printing, publishing, and allied industries
616 = Electrical goods, hardware, and plumbing equipment
656 = Apparel and accessories stores, except shoe
667 = Motor vehicles and accessories retailing
726 = Security and commodity brokerage and invest companies
807 = Accounting, auditing, and bookkeeping services
858 = Bowling alleys, and billiard and pool parlors
859 = Misc entertainment and recreation services
868 = Medical and other health services, except hospitals

Class of worker -- Detailed
0 = N/A
10 = Self-employed
11 = Employer
12 = Working on own account
13 = Self-employed, not incorporated
14 = Self-employed, incorporated
20 = Works for wages
21 = Works on salary (1920)
22 = Wage/salary, private
23 = Wage/salary at non-profit
24 = Wage/salary, government
25 = Federal govt employee
26 = Armed forces
27 = State govt employee
28 = Local govt employee
29 = Unpaid family worker

Occupation in 1910, 1980 basis
4 = Chief executives and general administrators, public administ
5 = Administrators and officials, public administration
13 = Managers, marketing, advertising, and public relations
14 = Administrators, education and related fields
27 = Personnel, training, and labor relations specialists
28 = Purchasing agents and buyers, farm products
29 = Buyers, wholesale and retail trade, except farm products
36 = Inspection and compliance officers, except construction
64 = Computer systems analysts and scientists
65 = Operations and systems researchers and analysts

Industry in 1910, 1980 basis
42 = Crude petroleum and natural gas extraction
50 = Nonmetallic mining and quarrying, except fuel
102 = Canned and preserved fruits and vegetables
121 = Misc. food preparations and kindred prods.
140 = Dyeing and finishing textiles, except wool and knit goods
172 = Printing, publishing, and allied industries, except newspape
201 = Miscellaneous petroleum and coal products
211 = Other rubber products, and plastics footwear and belting
251 = Cement, concrete, gypsum, and plaster products
262 = Misc. nonmetallic mineral and stone prods.
270 = Blast furnaces, steelworks, rolling and finishing mills
312 = Construction and material handling machines
341 = Radio, T.V., and communication equipment
342 = Electrical machinery, equipment, and supplies, n.e.c.
350 = Electrical machinery, equipment, and supplies, n.s.
351 = Motor vehicles and motor vehicle equipment
362 = Guided missiles, space vehicles, and parts
370 = Cycles and misc. transportation equipment
372 = Optical and health services and supplies
381 = Watches, clocks, and clockwork operated devices
442 = Telegraph and miscellaneous communication services
462 = Electric and gas, and other combinations
630 = Apparel and accessory stores, except shoe
640 = Household appliances, T.V., and radio stores
651 = Sporting goods, bicycles, and hobby stores
661 = Sewing, needlework, and piece goods stores
710 = Security, commodity brokerage, and investment companies
712 = Real estate, including real estate-insurance-law offices
722 = Services to dwellings and other buildings
730 = Commercial research, development, and testing labs
732 = Business management and consulting services
770 = Lodging places, except hotels and motels
801 = Bowling alleys, billiard and pool parlors
802 = Misc. entertainment and recreation services
861 = Job training and vocational rehabilitation services
870 = Residential care facilities, without nursing
882 = Engineering, architectural, and surveying services
890 = Accounting, auditing, and bookkeeping services
891 = Noncommercial educational and scientific research
892 = Miscellaneous professional and related services
921 = Public finance, taxation, and monetary policy
922 = Administration of human resources programs
930 = Administration of environmental quality and housing programs
932 = National security and international affairs
992 = Unemployed, has not worked in last 5 years

Quarters unemployed last year
0 = N/A
1 = Not unemployed last year
2 = Up to one quarter unemployed last year
3 = Two quarters unemployed
4 = Three quarters unemployed
5 = Four quarters unemployed

1 = No (blank)
2 = Yes
8 = Illegible
9 = Unknown

Deaf and dumb
1 = No (blank)
2 = Yes
3 = Dumb only
4 = Deaf only
8 = Illegible
9 = Unknown

Person received farm schedule
0 = No (blank)
1 = Received 1st schedule in household
2 = Received 2nd schedule in hh
3 = 3rd
4 = 4th
5 = 5th

Reason for mother link
1 = Simple link
2 = Probability link
3 = Hand link
4 = Simple reject
5 = Probability reject
6 = Hand un-link

Reason for wife link
1 = Simple link
2 = Probability link
3 = Hand link
4 = Simple reject
5 = Probability reject

Born in the US
1 = US born

Legibility as Binary Variable
0 = Illegible
1 = Legible

Case found in FTM CD
0 = NonMilitary
1 = Military

Branch of Service
0 = Nonmilitary

Type of Discharge
1 = Honorable
2 = General/Administrative
3 = Bad Conduct
4 = Dishonorable
5 = Furlough
6 = Reenlisted

Discharged as Enemy Alien
0 = Other
1 = Enemy Alien

Political Status Paternal
0 = Neutral
1 = Allied
2 = Central
3 = Irish
4 = CentralSubject
5 = American

Branch of Service Recoded
0 = NonMilitary
1 = Conscript
2 = Volunteer
3 = Professional

Enlistment Status
0 = Nonmilitary
1 = Maybe influenced by events overseas
2 = Volunteered ante Registration
3 = Volunteered post registration
4 = Conscripted
5 = Entered Prior to Conflict

Occ1950Recoded
0 = Unemployed
1 = White Collar
2 = High Blue Collar
3 = Low Blue Collar

Married before Registration Day
0 = Unmarried
1 = Married
2 = Unknown

Citizenship on R-Day
0 = Foreign Citizen
1 = Natural-Born Citizen
2 = Naturalized before 1917

Marital Status as Binary
0 = Unmarried
1 = Married

Employment as Binary
0 = Unemployed
100 = Employed

Resident Alien
0 = Other
1 = Alien

Resident Alien 1920
1 = Resident Alien

Parents of the same or different Ethnicity
0 = Heterogeneous
1 = Homogeneous

0 = Unemployed
1 = White-Collar
2 = Unskilled Blue-Collar
3 = Skilled Blue-Collar
4 = Farm Owner/Manager
5 = Farm Worker