MH
Mary Henderson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Grundy-County, Illinois
Our Model Tree links this Mary Henderson across the 1930 and 1940 US Censuses in Grundy-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 9-person household.
Age 17
b. ~1923
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Grundy-County, Illinois |
| Surname | Henderson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Highland Twp |
| 1935 Residence (County) | Grundy |
| Additional Details | |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Highland Twp |
| Est. Birth Year | ~1923 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Marjorie Henderson | Daughter | — | 9 | ~1931 |
| Helen Henderson | Daughter | — | 11 | ~1929 |
| Erna Henderson | Daughter | — | 5 | ~1935 |
| Mary Henderson | Daughter | — | 17 | ~1923 |
| Dorothy Henderson | Daughter | — | 15 | ~1925 |
| George Henderson | Head | — | 44 | ~1896 |
| Willis Henderson | Son | — | 8 | ~1932 |
| Ray Henderson | Son | — | 13 | ~1927 |
| Ester Henderson | Spouse | — | 39 | ~1901 |
Census Appearances
1930
Grundy, Illinois
Daughter, age 7
Grundy, Illinois · implied b. ~1923 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Henderson |
| Given Name | Mary E |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Grundy-County, Illinois
Daughter, age 17
Grundy-County, Illinois · implied b. ~1923 — 9 household members
| Surname | Henderson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Highland Twp |
| 1935 Residence (County) | Grundy |
| Highest Grade | H 4 |
| 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 Henderson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Henderson
Daughter · 1940 · age 17 · b. ~1923 · Illinois
★ You are viewing this record
Sibling
Erna Henderson
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ray Henderson
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marjorie Henderson
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Henderson
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Henderson
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Willis Henderson
Sibling · 1940 · age 8
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 — Grundy-County, Illinois
Open full size
1940 US Federal Census — Grundy-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00809-00229)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Hellan H Broderick | 69 | Head | Farmer | Illinois |
| 2 | Nellie Broderick | 65 | Wife | — | Illinois |
| 3 | Joe Broderick | 36 | Son | Farmer | Illinois |
| 4 | Thomas Broderick | 32 | Son | Laborer | Illinois |
| 5 | James Broderick | 29 | Son | Laborer | Illinois |
| 6 | Edmund Broderick | 27 | Son | Salesman | Illinois |
| 7 | Mike Ralph | 50 | Head | Farmer | Illinois |
| 8 | Nora Ralph | 37 | Wife | — | Illinois |
| 9 | Donald Ralph | 15 | Son | Student | Illinois |
| 10 | Delorous Ralph | 14 | Daughter | — | Illinois |
| 11 | Thos Coughlin | 72 | Head | — | Illinois |
| 12 | Mary Coughlin | 63 | Wife | — | Illinois |
| 13 | Maggie Coughlin | 36 | Daughter | — | Illinois |
| 14 | Ray Coughlin | 32 | Son | Farmer | Illinois |
| 15 | Jerry Coughlin | 28 | Son | Farmer | Illinois |
| 16 | Timothy Coughlin | 26 | Son | Farmer | Illinois |
| 17 | George Henderson | 44 | Head | Farmer | Illinois |
| 18 | Ester Henderson | 39 | Wife | — | Illinois |
| 19 | Mary Henderson THIS PERSON | 17 | Daughter | — | Illinois |
| 20 | Dorothy Henderson | 15 | Daughter | — | Illinois |
| 21 | Ray Henderson | 13 | Son | — | Illinois |
| 22 | Helen Henderson | 11 | Daughter | — | Illinois |
| 23 | Marjorie Henderson | 9 | Daughter | — | Illinois |
| 24 | Willis Henderson | 8 | Son | — | Illinois |
| 25 | Erna Henderson | 5 | Daughter | — | Illinois |
| 26 | W J Jeffries | 64 | Head | Chicken Buyer | Illinois |
| 27 | Catherine Jeffries | 56 | Wife | — | Illinois |
| 28 | Avon Jeffries | 16 | Daughter | Student | Illinois |
| 29 | Catherine Broderick | 63 | Head | — | Illinois |
| 30 | Nora Broderick | 28 | Daughter | Teacher | Illinois |
| 31 | Mary Broderick | 27 | Daughter | Clerk | Illinois |
| 32 | Thomas Broderick | 26 | Son | Farmer | Illinois |
| 33 | Serita Broderick | 21 | Daughter | — | Illinois |
| 34 | Bruce Racinowski | 17 | Lodger | Student | Chicago |
| 35 | Henry Racinowski | 16 | Lodger | Student | Chicago |
| 36 | Wayne Wolfe | 49 | Head | Farmer | Illinois |
| 37 | Helena Wolfe | 38 | Wife | — | Illinois |
| 38 | Laverne Wolfe | 22 | Step-son | Farmer | Illinois |
| 39 | Wood Wolfe | 19 | Son | Farmer | Illinois |
| 40 | Roy Wolfe | 17 | Son | Farmer | 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)