MF
Mary Frederick — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Waukesha-County, Wisconsin
Our Model Tree links this Mary Frederick across the 1930 and 1940 US Censuses in Waukesha-County, Wisconsin (XGBoost, ~Confirmed) — first a spouse (b.~1895), then head of a 6-person household.
Age 45
b. ~1895
Female
Spouse
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Waukesha-County, Wisconsin |
| Surname | Frederick |
| Given Name | Mary @ |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Waukesha City |
| 1935 Residence (County) | Waukesha |
| Additional Details | |
| Hours Worked | 5 |
| Income (1939) | 0 |
| Highest Grade | 6 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Waukesha City |
| Est. Birth Year | ~1895 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Frank Frederick | Head | — | 42 | ~1898 |
| Carol Frederick | Daughter | — | 15 | ~1925 |
| Mary Frederick | Spouse | — | 45 | ~1895 |
| Charles Frederick | Son | — | 13 | ~1927 |
| Kathleen Frederick | Daughter | — | 11 | ~1929 |
| Irene Frederick | Daughter | — | 16 | ~1924 |
Census Appearances
1930
Waukesha, Wisconsin
Spouse, age 34
Waukesha, Wisconsin · implied b. ~1896 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | Mae |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 28 |
| Father's Birthplace | Germany |
| Mother's Birthplace | New York |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Waukesha-County, Wisconsin
Spouse, age 45
Waukesha-County, Wisconsin · implied b. ~1895 — 6 household members
| Surname | Frederick |
| Given Name | Mary @ |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Waukesha City |
| 1935 Residence (County) | Waukesha |
| Hours Worked | 5 |
| Income (1939) | 0 |
| Highest Grade | 6 |
| 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 Frederick across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Frederick
Spouse · 1940 · age 45 · b. ~1895 · Wisconsin
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Waukesha-County, Wisconsin
Open full size
1940 US Federal Census — Waukesha-County, Wisconsin
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-04534-00779)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Dorothy Schmucki | 23 | daughter | Stenographer | Wisconsin |
| 42 | Marion Schmucki | 16 | daughter | — | Wisconsin |
| 43 | Thomas J Boorse | 50 | head | Accountant | Wisconsin |
| 44 | Velma Boorse | 46 | wife | — | Illinois |
| 45 | Jane Ann Boorse | 11 | daughter | — | Wisconsin |
| 46 | Guy Mabb | 54 | head | Engineer | Wisconsin |
| 47 | Mary A Mabb | 57 | wife | — | Wisconsin |
| 48 | Jewel Kastiel | 21 | daughter | Maid | Wisconsin |
| 49 | David J Kastiel | 3 | grandson | — | Wisconsin |
| 50 | Ira Harrison | 65 | head | — | Wisconsin |
| 51 | Frank P Frederick | 42 | head | Filler Bottle | Wisconsin |
| 52 | Mary @ Frederick THIS PERSON | 45 | wife | — | Illinois |
| 53 | Irene Frederick | 16 | daughter | — | Wisconsin |
| 54 | Carol Frederick | 15 | daughter | — | Wisconsin |
| 55 | Charles Frederick | 13 | son | — | Wisconsin |
| 56 | Kathleen Frederick | 11 | daughter | — | Wisconsin |
| 57 | Edgar Rattke | 27 | head | Order Filler | Wisconsin |
| 58 | Almide @ Rattke | 23 | wife | Bookkeeper | Iowa |
| 59 | Charles Adams | 57 | head | Carpenter | Wisconsin |
| 60 | Hannah @ Adams | 55 | wife | — | England |
| 61 | William Adams | 30 | son | — | Wisconsin |
| 62 | Robert Adams | 25 | son | Service Dept | Wisconsin |
| 63 | Frank Adams | 24 | son | Drafting | Wisconsin |
| 64 | David Adams | 20 | son | Pattern Maker | Wisconsin |
| 65 | Richard Adams | 20 | son | Pattern Maker Apprentice | Wisconsin |
| 66 | Betty Adams | 16 | daughter | — | Wisconsin |
| 67 | Edward Adams | 14 | son | — | Wisconsin |
| 68 | Emma @ Thornton | 82 | head | — | Wisconsin |
| 69 | Earl Pilara | 23 | grandson | Helper | Wisconsin |
| 70 | August Geralski | 45 | head | Finisher | Germany |
| 71 | Louise @ Geralski | 42 | wife | — | Wisconsin |
| 72 | Julius Geralski | 21 | son | Wire Cutter | Wisconsin |
| 73 | Louis Geralski | 19 | son | — | Wisconsin |
| 74 | Helen Geralski | 17 | daughter | — | Wisconsin |
| 75 | Raymond Geralski | 14 | son | — | Wisconsin |
| 76 | Duane Geralski | 2 | son | — | Wisconsin |
| 77 | Robert Gardinier | 25 | head | Core Maker | Minnesota |
| 78 | Esther @ Gardinier | 23 | wife | — | Wisconsin |
| 79 | Joan Gardinier | 3 | daughter | — | Wisconsin |
| 80 | Richard Gardinier | 1 | son | — | Wisconsin |
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)