JG
John Grady — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Sangamon-County, Illinois
Our Model Tree links this John Grady across the 1930 and 1940 US Censuses in Sangamon-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1897), then head of a 10-person household.
Age 43
b. ~1897
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Sangamon-County, Illinois |
| Surname | Grady |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Woodside Township |
| 1935 Residence (County) | Sangamon |
| Additional Details | |
| Occupation | Clerk |
| Industry | Post Office |
| Class of Worker | GW |
| Hours Worked | 39 |
| Income (1939) | 2400 |
| Highest Grade | H 2 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Clerk |
| Township / Ward | Woodside Township |
| Est. Birth Year | ~1897 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Grady | Head | — | 43 | ~1897 |
| James Grady | Son | — | 14 | ~1926 |
| Margaret Grady | Spouse | — | 42 | ~1898 |
| Mary Grady | Daughter | — | 9 | ~1931 |
| Richard Grady | Son | — | 15 | ~1925 |
| Patty Grady | Daughter | — | 12 | ~1928 |
| Jack Grady | Son | — | 20 | ~1920 |
| Larry Grady | Son | — | 8 | ~1932 |
| Eugenia Grady | Daughter | — | 10 | ~1930 |
| Robert Grady | Son | — | 18 | ~1922 |
Census Appearances
1930
Sangamon, Illinois
Head, age 32
Sangamon, Illinois · implied b. ~1898 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Grady |
| Given Name | John J |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 22 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Illinois |
| Occupation | Clerk |
| Industry | Internal Rev. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 6500 |
| Radio Set | R |
| Veteran | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Sangamon-County, Illinois
Head, age 43
Sangamon-County, Illinois · implied b. ~1897 — 10 household members
| Surname | Grady |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Woodside Township |
| 1935 Residence (County) | Sangamon |
| Occupation | Clerk |
| Industry | Post Office |
| Class of Worker | GW |
| Hours Worked | 39 |
| Income (1939) | 2400 |
| Highest Grade | H 2 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links John Grady across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Grady
Head · 1940 · age 43 · b. ~1897 · Illinois
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Sangamon-County, Illinois
Open full size
1940 US Federal Census — Sangamon-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00887-00973)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Carl Lockwood | 40 | Head | Salesman | Illinois |
| 2 | Mary Lockwood | 40 | Wife | — | Illinois |
| 3 | Kent Lockwood | 16 | Son | — | California |
| 4 | Marianne Lockwood | 14 | Daughter | — | Illinois |
| 5 | Donald Lockwood | 4 | Son | — | Illinois |
| 6 | Arthur Lockwood | 74 | Father | — | Illinois |
| 7 | Elizabeth Lockwood | 69 | Mother | — | Illinois |
| 8 | Elmer Lockwood | 45 | Brother | Cement Finisher | Illinois |
| 9 | James Trussell | 62 | Head | Proprietor | Illinois |
| 10 | Ida Trussell | 53 | Wife | — | Illinois |
| 11 | Helen Jones | 27 | Daughter | — | Illinois |
| 12 | Harry Jones | 27 | Son-in-law | Machinist | Illinois |
| 13 | Howard Smith | 36 | Lodger | Chief Inspector | Illinois |
| 14 | Doris Smith | 35 | Lodger | — | Illinois |
| 15 | Frank Williams | 48 | Head | Mine Boss | Illinois |
| 16 | Marie Williams | 46 | Wife | Compositor | Illinois |
| 17 | Betty Lou Williams | 20 | Daughter | — | Illinois |
| 18 | Lucy South | 71 | Mother-in-law | — | Illinois |
| 19 | Peter J. Mutant | 32 | Head | Miner | Illinois |
| 20 | Anna Mutant | 25 | Wife | — | Illinois |
| 21 | Josephine Mutant | 58 | Mother | — | Russia |
| 22 | James Smith | 38 | Head | Chemist | Missouri |
| 23 | Veda Smith | 32 | Wife | — | Kansas |
| 24 | James A. Smith | 5 | Son | — | Illinois |
| 25 | Nelson Bailey | 80 | Head | — | North Carolina |
| 26 | Rosa Bailey | 63 | Wife | — | Wisconsin |
| 27 | Edith Bailey | 30 | Daughter | Cashier | Illinois |
| 28 | James Monroe | 30 | Head | Machinist | Kentucky |
| 29 | Mary Monroe | 23 | Wife | — | Michigan |
| 30 | James Jr. Monroe | 1 | Son | — | Illinois |
| 31 | John J. Grady THIS PERSON | 43 | Head | Clerk | Illinois |
| 32 | Margaret Grady | 42 | Wife | — | Illinois |
| 33 | Jack Grady | 20 | Son | N.Y.A. School Student | Illinois |
| 34 | Robert Grady | 18 | Son | — | Illinois |
| 35 | Richard Grady | 15 | Son | — | Illinois |
| 36 | James Grady | 14 | Son | — | Illinois |
| 37 | Patty Grady | 12 | Daughter | — | Illinois |
| 38 | Eugenia Grady | 10 | Daughter | — | Illinois |
| 39 | Mary Grady | 9 | Daughter | — | Illinois |
| 40 | Larry Grady | 8 | Son | — | Illinois |
Related Census Records
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)