JM
James Mckay — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this James Mckay across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1900), then head of a 7-person household.
Age 40
b. ~1900
Male
Head
Born: Louisiana
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | McKay |
| Given Name | James Sr. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Louisiana |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | H 1 |
| 1935 Residence | Same House |
| Birth State | Louisiana |
| Birth Country | United States |
| Birthplace (normalized) | louisiana |
| Township / Ward | Chicago |
| Est. Birth Year | ~1900 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Sylvia Mckay | Daughter | — | 1 | ~1939 |
| Constance Mckay | Spouse | — | 30 | ~1910 |
| James Mckay | Son | — | 18 | ~1922 |
| Virginia Mckay | Daughter | — | 15 | ~1925 |
| Constance Mckay | Daughter | — | 3 | ~1937 |
| Monique Mckay | Daughter | — | 5 | ~1935 |
| James Mckay | Head | — | 40 | ~1900 |
Census Appearances
1930
Cook, Illinois
Other, age 30
Cook, Illinois · implied b. ~1900 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McKay |
| Given Name | James Jr. |
| Relationship to Head | Lodger |
| Sex | M |
| Color / Race | Black |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Louisiana |
| Father's Birthplace | Louisiana |
| Mother's Birthplace | Louisiana |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Louisiana |
| Birth Country | United States |
| Birthplace (normalized) | louisiana |
1940
Cook-County, Illinois
Head, age 40
Cook-County, Illinois · implied b. ~1900 — 7 household members
| Surname | McKay |
| Given Name | James Sr. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Louisiana |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Highest Grade | H 1 |
| 1935 Residence | Same House |
| Birth State | Louisiana |
| Birth Country | United States |
| Birthplace (normalized) | louisiana |
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 James Mckay across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Mckay
Head · 1940 · age 40 · b. ~1900 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00959-00415)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Jesse Willis | 52 | Head | Clerk | Ohio |
| 2 | Charlotte B Willis | 56 | Wife | — | Indiana |
| 3 | Lawrence Stewart | 40 | Lodger | Waiter | Illinois |
| 4 | Lillian B Stortz | 63 | Head | — | Pennsylvania |
| 5 | Frank Ross | 38 | Head | Labor | Georgia |
| 6 | Clara Ross | 38 | Wife | — | Georgia |
| 7 | Mary Ruth Ross | 7 | Daughter | — | Illinois |
| 8 | Alice G Ross | 4 | Daughter | — | Illinois |
| 9 | Willie G Ross | 1 | Son | — | Illinois |
| 10 | John Sr. Shelby | 53 | Head | Labor | Tennessee |
| 11 | Bertha Shelby | 54 | Wife | — | Iowa |
| 12 | Durand Shelby | 26 | Son | Labor | Illinois |
| 13 | John Jr. Shelby | 25 | Son | Porter | Illinois |
| 14 | Gertrude Shelby | 23 | Daughter | Maid | Illinois |
| 15 | Charles Shelby | 18 | Son | New Worker | Illinois |
| 16 | Dolores Shelby | 3 | Daughter | — | Illinois |
| 17 | Lucie Ellis | 73 | Head | — | Tennessee |
| 18 | Mamie Murray | 67 | Lodger | — | Indiana |
| 19 | Charles A Roeser | 67 | Lodger | Shipping Clerk | Missouri |
| 20 | Russell B Scott | 40 | Head | — | Arkansas |
| 21 | Estra Lee Scott | 34 | Wife | — | Arkansas |
| 22 | Rufus Perez | 46 | Head | Molder | Mexico |
| 23 | Pauline Perez | 36 | Wife | — | Tennessee |
| 24 | James Sr. Mckay THIS PERSON | 40 | Head | — | Louisiana |
| 25 | Constance Mckay | 30 | Wife | — | Georgia |
| 26 | James Jr. Mckay | 18 | Son | — | Illinois |
| 27 | Virginia Mckay | 15 | Daughter | — | Illinois |
| 28 | Monique Mckay | 5 | Daughter | — | Illinois |
| 29 | Constance Mckay | 3 | Daughter | — | Illinois |
| 30 | Sylvia Mckay | 1 | Daughter | — | Illinois |
| 31 | Hennie Jackson | 54 | Head | — | Mississippi |
| 32 | Taylor Wilson | 44 | Head | Carpenter | Mississippi |
| 33 | Mintie Wilson | 45 | Wife | — | Nebraska |
| 34 | John Wilson | 22 | Son | New Worker | Illinois |
| 35 | Hazel Wilson | 20 | Daughter | New Worker | Illinois |
| 36 | Clarence Hudson | 45 | Head | Foundry Labor | Georgia |
| 37 | Cecilia Hudson | 50 | Wife | — | Georgia |
| 38 | Edward Mclean | 50 | Head | Instructor | Georgia |
| 39 | Madeline Mclean | 40 | Wife | — | Ohio |
| 40 | John Mclean | 19 | Son | — | Illinois |
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)