MS
Mary Simons — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Jefferson-County, Colorado
Our Model Tree links this Mary Simons across the 1930 and 1940 US Censuses in Jefferson-County, Colorado (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 10-person household.
Age 14
b. ~1926
Female
Daughter
Born: Colorado
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Jefferson-County, Colorado |
| Surname | Simons |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | Edgewater |
| 1935 Residence (County) | Jefferson |
| Additional Details | |
| Highest Grade | No 7 |
| 1935 Residence | Colorado |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Township / Ward | Election Precinct 22 Edgewater No 1 |
| Est. Birth Year | ~1926 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Leonard Simons | Son | — | 15 | ~1925 |
| Mary Simons | Daughter | — | 14 | ~1926 |
| Alice Simons | Daughter | — | 1 | ~1939 |
| Ruth Simons | Daughter | — | 6 | ~1934 |
| Fred Simons | Head | — | 52 | ~1888 |
| George Simons | Son | — | 12 | ~1928 |
| Harold Simons | Son | — | 4 | ~1936 |
| Lucille Simons | Daughter | — | 8 | ~1932 |
| Robert Simons | Son | — | 10 | ~1930 |
| Margaret Simons | Spouse | — | 35 | ~1905 |
Census Appearances
1930
Jefferson, Colorado
Daughter, age 4
Jefferson, Colorado · implied b. ~1926 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Simons |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | South Dakota |
| Mother's Birthplace | Kansas |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
Jefferson-County, Colorado
Daughter, age 14
Jefferson-County, Colorado · implied b. ~1926 — 10 household members
| Surname | Simons |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | Edgewater |
| 1935 Residence (County) | Jefferson |
| Highest Grade | No 7 |
| 1935 Residence | Colorado |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
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 Simons across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Simons
Daughter · 1940 · age 14 · b. ~1926 · Colorado
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Sibling
Leonard Simons
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harold Simons
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Simons
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Simons
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Simons
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth Simons
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lucille Simons
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 — Jefferson-County, Colorado
Open full size
1940 US Federal Census — Jefferson-County, Colorado
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00465-00600)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Fred L. Simons | 52 | Head | Laborer | South Dakota |
| 42 | Margaret M. Simons | 35 | Wife | — | Kansas |
| 43 | Leonard L. Simons | 15 | Son | — | Colorado |
| 44 | Mary E. Simons THIS PERSON | 14 | Daughter | — | Colorado |
| 45 | George J. Simons | 12 | Son | — | Colorado |
| 46 | Robert E. Simons | 10 | Son | — | Colorado |
| 47 | Lucille M. Simons | 8 | Daughter | — | Colorado |
| 48 | Ruth W. Simons | 6 | Daughter | — | Colorado |
| 49 | Harold F. Simons | 4 | Son | — | Colorado |
| 50 | Alice J. Simons | 1 | Daughter | — | Colorado |
| 51 | Genevieve Snyder | 67 | Head | — | Iowa |
| 52 | John J. Sherlin | 63 | Head | — | Illinois |
| 53 | Estella M. Sherlin | 53 | Wife | — | Illinois |
| 54 | Francis John Sherlin | 20 | Son | Machinist Helper | Colorado |
| 55 | Edmond Carlson | 39 | Head | Delivery Truck Driver | Iowa |
| 56 | Kathryn Carlson | 26 | Wife | — | Colorado |
| 57 | Jacquelyn Carlson | 3 | Daughter | — | Colorado |
| 58 | Minnie Baker | 69 | Head | — | Illinois |
| 59 | Glenn Gibbons | 58 | Head | Cashier | Arkansas |
| 60 | Alice M. Gibbons | 10 | Adopted daughter | — | Colorado |
| 61 | Clarence G. Gilmore | 50 | Head | Grocery Store Accountant Manager | Nebraska |
| 62 | Dessie M. Gilmore | 46 | Wife | Saleslady | Missouri |
| 63 | Pauline Gilmore | 19 | Daughter | Fountain Girl | Colorado |
| 64 | Charles Gilmore | 17 | Son | Cook | Colorado |
| 65 | Richard F. Gilmore | 15 | Son | — | Colorado |
| 66 | Ruth G. Robinson | 41 | Head | Owner + Manager | Kansas |
| 67 | Merle E. Robinson | 20 | Son | Assistant Clerk | Oklahoma |
| 68 | Roberta Jean Robinson | 16 | Daughter | — | Oklahoma |
| 69 | Le Roy Paul Robinson | 13 | Son | — | Texas |
| 70 | Charles (Dora) Shields | 79 | Head | Real Estate Agent | Iowa |
| 71 | Florence Inez Craig | 65 | Sister | — | Iowa |
| 72 | James Morgan | 68 | Head | — | Kansas |
| 73 | Mary B. Graham | 75 | Head | — | Missouri |
| 74 | Margaret Ann Kahn | 61 | Head | — | England |
| 75 | John W. Blue | 77 | Head | — | Wisconsin |
| 76 | Edgar G. Secord | 51 | Head | — | Missouri |
| 77 | Lottie L. Secord | 39 | Wife | — | Missouri |
| 78 | Edgar M. Secord | 21 | Son | Clerk | Colorado |
| 79 | Frederick H. Hansen | 35 | Head | Car Inspector | Colorado |
| 80 | Lois F. Hansen | 34 | Wife | — | Texas |
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)