MC
Mary Clark — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Clark across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1873), then head of a 5-person household.
Age 67
b. ~1873
Female
Spouse
Born: Vermont
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Clark |
| Given Name | Mary S. |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 67 |
| Marital Status | Married |
| Birthplace | Vermont |
| 1935 Residence (City) | Medford |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
| Township / Ward | Medford |
| Est. Birth Year | ~1873 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Mabel Morrison | Daughter | — | 37 | ~1903 |
| Charles Clark | Head | — | 69 | ~1871 |
| Ann Morrison | Other | — | 2 | ~1938 |
| Helen Morrison | Other | — | 4 | ~1936 |
| Mary Clark | Spouse | — | 67 | ~1873 |
Census Appearances
1920
Middlesex, Massachusetts
Spouse, age 45
Middlesex, Massachusetts · implied b. ~1875 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Mary E |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Vermont |
| Father's Birthplace | Vermont |
| Mother's Birthplace | Vermont |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
1930
Middlesex, Massachusetts
Other, age 57
Middlesex, Massachusetts · implied b. ~1873 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clarke |
| Given Name | Mary E. |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | Vermont |
| Age at First Marriage | 20 |
| Father's Birthplace | Vermont |
| Mother's Birthplace | Vermont |
| Can Read/Write | Yes |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
1940
Middlesex-County, Massachusetts
Spouse, age 67
Middlesex-County, Massachusetts · implied b. ~1873 — 5 household members
| Surname | Clark |
| Given Name | Mary S. |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 67 |
| Marital Status | Married |
| Birthplace | Vermont |
| 1935 Residence (City) | Medford |
| 1935 Residence (County) | Middlesex |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
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 Clark across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Clark
Spouse · 1940 · age 67 · b. ~1873 · Massachusetts
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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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01612-00853)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Colmee | 43 | wife | Sewing | Canada French |
| 2 | Alice J. Kinsman | 79 | head | — | Maine |
| 3 | Nathalie S. Kinsman | 58 | daughter | — | Massachusetts |
| 4 | Cecil J. Lewis | 60 | lodger | Attendant | Nebraska |
| 5 | Irving L. Fish | 33 | lodger | Salesman | New Hampshire |
| 6 | Lyman D. Goodwin | 49 | head | Pharmacist | Maine |
| 7 | Ivan E. Goodwin | 44 | wife | — | Maine |
| 8 | Charles A. Clark | 69 | head | Traveling Salesman | Vermont |
| 9 | Mary S. Clark THIS PERSON | 67 | wife | — | Vermont |
| 10 | Mabel Morrison | 37 | daughter | Assistant Secretary | Massachusetts |
| 11 | Helen G. Morrison | 4 | granddaughter | — | Connecticut |
| 12 | Ann Morrison | 2 | granddaughter | — | Massachusetts |
| 13 | John G. Ordon | 57 | head | Stationary Engineer | Scotland |
| 14 | Lillian E. Ordon | 48 | wife | Sewing Machine Operator | Poland |
| 15 | Wanda J. Ordon | 17 | daughter | — | Massachusetts |
| 16 | Samuel E. Sewall | 65 | head | — | Massachusetts |
| 17 | Mabel Sewall | 64 | wife | — | Massachusetts |
| 18 | Benjamin Thomas | 51 | head | Pay Roll Auditor | Massachusetts |
| 19 | Gladys S. Thomas | 50 | wife | — | Massachusetts |
| 20 | Donald Thomas | 20 | son | — | Massachusetts |
| 21 | Frances S. French | 81 | head | — | South Carolina |
| 22 | Norman Kitty P. French | 76 | sister | — | South Carolina |
| 23 | Edward W. Weinhold | 69 | head | Printer | Maine |
| 24 | Cora S. Weinhold | 64 | wife | — | Maine |
| 25 | C. Beatrice Weinhold | 41 | daughter | — | Massachusetts |
| 26 | Weinhold | None | — | — | — |
| 27 | Albert S. Pond | 53 | head | General Worker | Massachusetts |
| 28 | Mary C. Pond | 47 | wife | Dressmaker | Massachusetts |
| 29 | Charles A. Pond | 22 | son | Estimator | Massachusetts |
| 30 | Richard B. Pond | 16 | son | — | Massachusetts |
| 31 | Johnathan Emerson | 75 | head | — | Vermont |
| 32 | Anne S. Emerson | 73 | wife | — | Massachusetts |
| 33 | Margie Emerson | 42 | daughter | — | Massachusetts |
| 34 | Hugh Reynolds | 46 | head | Superintendent | Eire |
| 35 | Helen S. Reynolds | 46 | wife | — | Eire |
| 36 | Winifred Reynolds | 18 | daughter | — | Massachusetts |
| 37 | Mary Reynolds | 14 | daughter | — | Massachusetts |
| 38 | Margaret Reynolds | 13 | daughter | — | Massachusetts |
| 39 | Hugh Reynolds | 9 | son | — | Massachusetts |
| 40 | John Reynolds | 7 | son | — | Massachusetts |
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)