MJ
Mary Jones — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Jones across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1898), then head of a 5-person household.
Age 42
b. ~1898
Female
Spouse
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Jones |
| Given Name | Mary F. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Malden City |
| Est. Birth Year | ~1898 |
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 |
|---|---|---|---|---|
| Mary Jones | Daughter | — | 13 | ~1927 |
| Fred Jones | Head | — | 43 | ~1897 |
| John Jones | Son | — | 7 | ~1933 |
| William Jones | Son | — | 15 | ~1925 |
| Mary Jones | Spouse | — | 42 | ~1898 |
Census Appearances
1920
Middlesex, Massachusetts
Spouse, age 23
Middlesex, Massachusetts · implied b. ~1897 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jones |
| Given Name | Mary F |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Spouse, age 33
Middlesex, Massachusetts · implied b. ~1897 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jones |
| Given Name | Mary F |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 21 |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Spouse, age 42
Middlesex-County, Massachusetts · implied b. ~1898 — 5 household members
| Surname | Jones |
| Given Name | Mary F. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden City |
| 1935 Residence (County) | Middlesex |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Jones 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 Jones
Spouse · 1940 · age 42 · b. ~1898 · 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
35 people indexed on this census page (nara:1940:m-t0627-01609-00517)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frank Le Roy | 66 | Head | Machinist | Massachusetts |
| 2 | Margaret B. Le Roy | 66 | Wife | — | Canada-English |
| 3 | Rothern B. Jr. Porter | 32 | Head | Research Director | Massachusetts |
| 4 | Dorothy Porter | 26 | Wife | — | Massachusetts |
| 5 | Marion L. Porter | 2 | Daughter | — | Massachusetts |
| 6 | Lawrence S. Bassett | 30 | Head | Shipper | Massachusetts |
| 7 | Isabelle R. B. Bassett | 30 | Wife | — | Massachusetts |
| 8 | Ernestine Bassett | 12 | Daughter | — | Massachusetts |
| 9 | Marjorie Bassett | 8 | Daughter | — | Massachusetts |
| 10 | Mary L. Codling | 78 | Head | — | Massachusetts |
| 11 | Mabel A. Codling | 57 | Daughter | Teacher | Massachusetts |
| 12 | Walter H. B. Harding | 35 | Head | Teller | Massachusetts |
| 13 | Helen L. Harding | 32 | Wife | — | Massachusetts |
| 14 | Walter S. Harding | 1 | Son | — | Massachusetts |
| 15 | John D. Sr. B. Ford | 70 | Head | Printer | Canada-English |
| 16 | Alice H. Ford | 26 | Daughter | Stenographer | Massachusetts |
| 17 | Grace G. Ford | 20 | Daughter | Filing Clerk | Massachusetts |
| 18 | Pitt R. B. Calkin | 54 | Head | Broker | Maine |
| 19 | M. Pearl Calkin | 57 | Wife | — | Massachusetts |
| 20 | Fred Jones | 43 | Head | Cabinet Maker | Massachusetts |
| 21 | Mary F. Jones THIS PERSON | 42 | Wife | — | Massachusetts |
| 22 | William Jones | 15 | Son | — | Massachusetts |
| 23 | Mary Jones | 13 | Daughter | — | Massachusetts |
| 24 | John Jones | 7 | Son | — | Massachusetts |
| 25 | James O. B. Willis | 59 | Head | Locomotive Engineer | Massachusetts |
| 26 | Helen C. Willis | 62 | Wife | — | Massachusetts |
| 27 | Sally M. Willis | 42 | Daughter | Buyer | Massachusetts |
| 28 | Patrick J. B. O'Brien | 67 | Head | — | Ireland |
| 29 | Margaret M. O'Brien | 26 | Daughter | Bookkeeper | Massachusetts |
| 30 | Abraham C. B. Levine | 28 | Head | Shipper | Poland |
| 31 | Goldie Levine | 26 | Wife | Bookkeeper | Massachusetts |
| 32 | Clara L. Briggs | 87 | Head | — | Maine |
| 33 | Willis B. B. Briggs | 62 | Son | — | Massachusetts |
| 34 | Frances I. Briggs | 32 | Grandchild | Filing Clerk | Massachusetts |
| 35 | Joseph Compano | 60 | Head | Grocer | Italy |
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)