MF
Margaret Fitzpatrick — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Margaret Fitzpatrick across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Frank & Irene — first a daughter (b.~1919), then head of a 5-person household.
Age 21
b. ~1919
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Fitzpatrick |
| Given Name | Margaret |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | C-2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| Est. Birth Year | ~1919 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Frances Fitzpatrick | Son | — | 22 | ~1918 |
| Margaret Fitzpatrick | Daughter | — | 21 | ~1919 |
| Irene Fitzpatrick | Spouse | — | 56 | ~1884 |
| William Fitzpatrick | Son | — | 20 | ~1920 |
| Frank Fitzpatrick | Head | — | 56 | ~1884 |
Census Appearances
1920
Cook, Illinois
Daughter, age 1
Cook, Illinois · implied b. ~1919 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Fitzpatrick |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 11
Cook, Illinois · implied b. ~1919 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Fitzpatrick |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 21
Cook-County, Illinois · implied b. ~1919 — 5 household members
| Surname | Fitzpatrick |
| Given Name | Margaret |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Highest Grade | C-2 |
| 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 Margaret Fitzpatrick across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frank Fitzpatrick (~0.92 confidence) and mother Irene Fitzpatrick (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Fitzpatrick
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Irene Fitzpatrick
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Fitzpatrick
Daughter · 1940 · age 21 · b. ~1919 · Illinois
★ You are viewing this record
Sibling
Frances Fitzpatrick
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Fitzpatrick
Sibling · 1940 · age 20
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-t0627-00996-00738)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ann Koch | 57 | maid | Housekeeper | Iowa |
| 2 | James F. O'Connor | 43 | Head | Electrician | Illinois |
| 3 | Frances H. O'Connor | 40 | Wife | — | Illinois |
| 4 | Frances M. O'Connor | 16 | daughter | — | Illinois |
| 5 | James E. O'Connor | 5 | son | — | Illinois |
| 6 | Margaret, Mrs. Kelly | 71 | Head | — | Illinois |
| 7 | Agnes Dritter | 21 | lodger | Stenographer | Wisconsin |
| 8 | Marie Koehler | 27 | lodger | Nurse | Kansas |
| 9 | Charlotte Dietrich | 19 | lodger | — | Wisconsin |
| 10 | Margaret Mcnamara | 46 | Head | Assembly Supervisor | Illinois |
| 11 | Anna Mcnamara | 41 | sister | — | Illinois |
| 12 | Patrick Mcnamara | 51 | brother | Policeman | Illinois |
| 13 | Frank T. Fitzpatrick | 56 | Head | Superintendent | Illinois |
| 14 | Irene A. Fitzpatrick | 56 | Wife | — | Illinois |
| 15 | Frances Fitzpatrick | 22 | son | Jr. Accountant | Illinois |
| 16 | Margaret Fitzpatrick THIS PERSON | 21 | daughter | — | Illinois |
| 17 | William Fitzpatrick | 20 | son | File Clerk | Illinois |
| 18 | George F. Rauch | 64 | Head | Timekeeper | New York |
| 19 | Anna Rauch | 48 | Wife | — | New York |
| 20 | Mary Rauch | 35 | Daughter | Bookkeeper | New Jersey |
| 21 | Charles Jr. Rauch | 20 | son | Shipping Clerk | New Jersey |
| 22 | Charles Joseph O'Don | 40 | Head | Control Clerk | Illinois |
| 23 | Vera O'Don | 36 | Wife | — | Illinois |
| 24 | Betty Jane O'Don | 14 | daughter | — | Illinois |
| 25 | Charles Richard O'Don | 10 | son | — | Illinois |
| 26 | Joseph James Cahill | 78 | Head | Salesman | United States |
| 27 | Nellie Cahill | 67 | Wife | — | Wisconsin |
| 28 | Edward M. Cahill | 30 | son | Salesman | Wisconsin |
| 29 | Margaret Madden | 73 | sister | — | Wisconsin |
| 30 | James H. Jacobson | 73 | Head | — | New York |
| 31 | Mary Jacobson | 75 | Wife | — | Illinois |
| 32 | Hulda Jacobson | 28 | daughter | Stenographer | Illinois |
| 33 | Elizabeth Howard | 51 | sister | — | Illinois |
| 34 | Frank Frederick | 34 | Head | Maintenance Carpenter | Illinois |
| 35 | Vera Frederick | 29 | Wife | — | Illinois |
| 36 | Frank Frederick | 0 | son | — | Illinois |
| 37 | Edwin Frederick | 26 | brother | Paint Finisher | Illinois |
| 38 | Allison Patton | 21 | brother-in-law | Woodworker | Illinois |
| 39 | Mary Hunt | 56 | Head | — | Irish Free State |
| 40 | Matthew Hunt | 31 | son | Lawyer | England |
Related Census Records
Search for Margaret Fitzpatrick
All Margaret Fitzpatrick Census Records Discover Fitzpatrick Family TreePedigree Summary
Margaret + 2 siblings
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)