MH
Mary Hendricks — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Hendricks across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1900), then head of a 4-person household.
Age 40
b. ~1900
Female
Spouse
Born: Connecticut
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Hendricks |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Connecticut |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same home |
| Birth State | Connecticut |
| Birth Country | United States |
| Birthplace (normalized) | connecticut |
| Township / Ward | Chicago City |
| 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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Eugene Hendricks | Son | — | 19 | ~1921 |
| Charles Hendricks | Son | — | 21 | ~1919 |
| Mary Hendricks | Spouse | — | 40 | ~1900 |
| Charles Hendricks | Head | — | 59 | ~1881 |
Census Appearances
1920
Cook, Illinois
Other, age 20
Cook, Illinois · implied b. ~1900 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hendricks |
| Given Name | Mary |
| Relationship to Head | daughter-in-law |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Married |
| Birthplace | Connecticut |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Connecticut |
| Can Read | No |
| Can Write | No |
| Speaks English | Yes |
| Birth State | Connecticut |
| Birth Country | United States |
| Birthplace (normalized) | connecticut |
1930
Cook, Illinois
Other, age 30
Cook, Illinois · implied b. ~1900 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hendricks |
| Given Name | Mary |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Connecticut |
| Age at First Marriage | 18 |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | United States |
| Can Read/Write | Yes |
| Birth State | Connecticut |
| Birth Country | United States |
| Birthplace (normalized) | connecticut |
1940
Cook-County, Illinois
Spouse, age 40
Cook-County, Illinois · implied b. ~1900 — 4 household members
| Surname | Hendricks |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Connecticut |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Highest Grade | No 8 |
| 1935 Residence | Same home |
| Birth State | Connecticut |
| Birth Country | United States |
| Birthplace (normalized) | connecticut |
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 Hendricks across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Hendricks
Spouse · 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-t0627-01002-00332)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Herman Hildebrand | 49 | Head | Night Watchman | New York |
| 2 | Lilla Hildebrand | 47 | Wife | — | Illinois |
| 3 | Irving Hildebrand | 21 | Son | Shop Work | Illinois |
| 4 | Kenneth Hildebrand | 19 | Son | Clerk | Illinois |
| 5 | Audrey Hildebrand | 12 | Daughter | — | Illinois |
| 6 | Theodor Wolf | 32 | Head | Reverend | Illinois |
| 7 | Rose Wolf | 29 | Wife | — | Illinois |
| 8 | Marshall Wolf | 5 | Son | — | Illinois |
| 9 | Elaine | Elane Wolf | 4 | Daughter | — | Illinois |
| 10 | Almer | Elmer Gnaedinger | 33 | Head | Collector | Illinois |
| 11 | Florence Gnaedinger | 33 | Wife | Telephone Operator | Illinois |
| 12 | Doris Mae Gnaedinger | 12 | Daughter | — | Illinois |
| 13 | Joan Carol Gnaedinger | 10 | Daughter | — | Illinois |
| 14 | Charles Koponya | 30 | Head | Machinist | New York |
| 15 | Margaret Koponya | 26 | Wife | — | Illinois |
| 16 | Nancy Koponya | 2 | Daughter | — | Illinois |
| 17 | John Rieks | 39 | Head | Porter | West Virginia |
| 18 | Julia Rieks | 25 | Wife | — | Hungary |
| 19 | Arline Rieks | 2 | Daughter | — | Illinois |
| 20 | John Jr. Rieks | 0 | Son | — | Illinois |
| 21 | Peder Pedersen | 43 | Head | Sheet Metal Worker | Norway |
| 22 | Mildred Pedersen | 36 | Wife | — | Oklahoma |
| 23 | Keegan Pedersen | 16 | Son | — | Illinois |
| 24 | Leona Pedersen | 15 | Daughter | — | Illinois |
| 25 | Else Pedersen | 32 | Sister | Switch Board Operator | Norway |
| 26 | Clinton Ullen | 48 | Head | Accounting | Ohio |
| 27 | Marie Ullen | 40 | Wife | — | Illinois |
| 28 | William Radthe | 46 | Head | Painter And Decorator | Illinois |
| 29 | Minnie Radthe | 44 | Wife | — | Illinois |
| 30 | Esther Radthe | 20 | Daughter | Office | Illinois |
| 31 | Carol Schultz | 5 | Niece | — | Illinois |
| 32 | Michael Gleason | 64 | Head | Chauffeur | Illinois |
| 33 | Winifred B. Gleason | 57 | Wife | — | Ireland |
| 34 | Frank Lemm | 51 | Head | Motorman | Illinois |
| 35 | Meta Lemm | 42 | Wife | — | Illinois |
| 36 | Rose Fallon | 68 | Head | — | Illinois |
| 37 | Charles Hendricks | 59 | Head | Papercutter | Missouri |
| 38 | Mary Hendricks THIS PERSON | 40 | Wife | — | Connecticut |
| 39 | Charles Jr. Hendricks | 21 | Son | Finisher | Illinois |
| 40 | Eugene Hendricks | 19 | Son | Packer | 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)