USA Census Records are made public after 70 years, so whilst all the census records up to 1940 are available the 1950 records will not be available until 2020.
1930 USA CENSUS RECORDS
The 1930 US Census forms have 32 columns and contains the following information:
PLACE OF ABODE
Col. 1: Street, avenue, road, etc.
Col. 2: House number (In cities)
Col. 3: No of dwelling house in order of enumeration
Col. 4: Family Number
Col. 5: Name of each person whose place of abode on April 1, 1930, was in this family.
Enter surname first, then the given name and middle initial, in any.
Include every person living on January 1, 1920.
Omit children born since January 1, 1920.
Col. 6: Relationship to head of house
Col. 7: Home owned or rented
Col. 8: Value of the home monthly payment
Col. 9: Radio Set
Col. 10: Live on Farm
Col. 11: Sex
Col. 12: Color or race
Col. 13: Age at last birthday
Col. 14: Marital status
Col. 15: Age at 1st marriage
Col. 16: Attended school?
Col. 17: Able to read and write?
PLACE OF BIRTH
Place of birth of each person enumerated and of his or her parents
Col. 18: Self
Col. 19: Father
Col. 20: Mother
NATIVITY AND MOTHER TONGUE
Col. 21: Language spoken in home before coming to the U.S.
Col. 22: Year of immigration
Col. 23: Naturalization
Col. 24: Speaks English
OCCUPATION AND INDUSTRY
Col. 25: Trade, profession, of kind of work
Col. 26: Industry or business
Col. 27: Class of work
Col. 28: At work yesterday?
Col. 29: Unemployment Schedule No.
Col. 30: Veteran?
Col. 31: What war?
Sp-Spanish American War
Col. 32: Farm Number