MP
Mary Phelps — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Phelps across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1924), then head of a 8-person household.
Age 16
b. ~1924
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Phelps |
| Given Name | Mary Louise |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | Hs 1 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| Est. Birth Year | ~1924 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Kenneth Phelps | Son | — | 11 | ~1929 |
| Cecelia Phelps | Spouse | — | 34 | ~1906 |
| Wallace Phelps | Son | — | 13 | ~1927 |
| James Phelps | Son | — | ~1940 | |
| Wallace Phelps | Head | — | 36 | ~1904 |
| Mary Phelps | Daughter | — | 16 | ~1924 |
| Robert Phelps | Son | — | 3 | ~1937 |
| Ruth Phelps | Daughter | — | 7 | ~1933 |
Census Appearances
1930
Cook, Illinois
Other, age 4
Cook, Illinois · implied b. ~1926 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Phelps |
| Given Name | Mary L. |
| Relationship to Head | Lodger |
| Sex | F |
| Color / Race | Black |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Tennessee |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 16
Cook-County, Illinois · implied b. ~1924 — 8 household members
| Surname | Phelps |
| Given Name | Mary Louise |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Income (1939) | 0 |
| Highest Grade | Hs 1 |
| 1935 Residence | Same Place |
| 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 Mary Phelps across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Phelps
Daughter · 1940 · age 16 · b. ~1924 · Illinois
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Sibling
Wallace Phelps
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth Phelps
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Phelps
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Phelps
Sibling · 1940 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kenneth Phelps
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
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-t0627-00956-00922)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Audrey Linton | 3 | Daughter | — | Same Place |
| 2 | Douglas Linton | 1 | Son | — | Same Place |
| 3 | Marcia Linton | 0 | Daughter | — | Same Place |
| 4 | Horace Fulton | 39 | Head | Photographer | Illinois |
| 5 | Agnes Fulton | 32 | Wife | — | Illinois |
| 6 | Joseph Fulton | 13 | Son | — | Illinois |
| 7 | James Fulton | 11 | Son | — | Illinois |
| 8 | Donell Fulton | 6 | Son | — | Illinois |
| 9 | August Swanson | 47 | Head | Milk Salesman | Sweden |
| 10 | Olga Swanson | 46 | Wife | — | Sweden |
| 11 | Dorothy Swanson | 23 | Daughter | Stenographer | Illinois |
| 12 | Harriett Swanson | 17 | Daughter | — | Illinois |
| 13 | James Richards | 72 | Head | — | Dorking, Eng. |
| 14 | Sarah Richards | 71 | Wife | — | England |
| 15 | Gertrude Richards | 38 | Daughter | Salesperson | Illinois |
| 16 | Fred M. Reutter | 34 | Head | Insurance | Illinois |
| 17 | Anne Reutter | 28 | Wife | Salesperson | Austria |
| 18 | Francis M. O'Shea | 56 | Head | Credit Manager | Iowa |
| 19 | Leonore Baxter | 50 | Sister | — | Iowa |
| 20 | Claude O'Shea | 19 | Nephew | Drug Clerk | Illinois |
| 21 | David O'Shea | 18 | Nephew | Drug Clerk | Illinois |
| 22 | Wallace Phelps | 36 | Head | Salesman | Minnesota |
| 23 | Cecelia Phelps | 34 | Wife | — | Illinois |
| 24 | Mary Louise Phelps THIS PERSON | 16 | Daughter | — | Illinois |
| 25 | Wallace Phelps | 13 | Son | — | Illinois |
| 26 | Kenneth Phelps | 11 | Son | — | Illinois |
| 27 | Ruth Phelps | 7 | Daughter | — | Illinois |
| 28 | Robert Phelps | 3 | Son | — | Illinois |
| 29 | James Phelps | 0 | Son | — | Illinois |
| 30 | Mary Schiller | 44 | Head | — | Hungary |
| 31 | William Schiller | 23 | Son | Mechanic | Illinois |
| 32 | Anne Schiller | 21 | Daughter | Telephone Operator | Illinois |
| 33 | Alfred Schiller | 20 | Son | Mechanic | Illinois |
| 34 | Gunhild Larson | 54 | Head | Bookkeeper | Illinois |
| 35 | Helen Larson | 60 | Wife | — | Sweden |
| 36 | Virginia Larson | 27 | Daughter | Stenographer | Illinois |
| 37 | George Varelas | 47 | Lodger | Cook | Greece |
| 38 | Guy Varelas | 35 | Lodger | — | Minnesota |
| 39 | Henry Fox | 54 | Head | Painter | Illinois |
| 40 | Lillian Fox | 53 | Wife | — | New York |
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)