MH
Mary Harris — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Harris across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Robert & Robert — first a spouse (b.~1915), then head of a 5-person household.
Age 25
b. ~1915
Female
Spouse
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Harris |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lowell City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Lowell City |
| Est. Birth Year | ~1915 |
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 |
|---|---|---|---|---|
| Frederick Harris | Head | — | 30 | ~1910 |
| Robert Harris | Son | — | 5 | ~1935 |
| Ralph Harris | Son | — | 3 | ~1937 |
| Frederick Harris | Son | — | 7 | ~1933 |
| Mary Harris | Spouse | — | 25 | ~1915 |
Census Appearances
1920
Middlesex, Massachusetts
Daughter, age 6
Middlesex, Massachusetts · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harris |
| Given Name | Mary A |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Daughter, age 16
Middlesex, Massachusetts · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harris |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Spouse, age 25
Middlesex-County, Massachusetts · implied b. ~1915 — 5 household members
| Surname | Harris |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lowell City |
| 1935 Residence (County) | Middlesex |
| Highest Grade | Hs 4 |
| 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 Harris across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Robert Harris (~0.92 confidence) and father Robert Harris (~0.92 confidence) and mother Annie Harris (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Robert Harris
b. ~1878
Source father
● Household
· direct · ~0.92
Father
Robert Harris
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Annie Harris
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Harris
Spouse · 1940 · age 25 · b. ~1915 · Massachusetts
★ You are viewing this record
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
39 people indexed on this census page (nara:1940:m-t0627-01691-00668)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Elizabeth Donahue | 66 | Head | — | Massachusetts |
| 42 | Nellie Lochern | 72 | Sister | — | Massachusetts |
| 43 | Thelios Q Kavouklatos | 30 | Head | Manager & Salesman | Massachusetts |
| 44 | Bessie Kavouklatos | 24 | Wife | Saleslady | New Hampshire |
| 45 | Bridget Mungovan | 76 | Head | — | Irish Free State |
| 46 | Hannah Walsh | 71 | Partner | — | Irish Free State |
| 47 | Abbie Humphrey | 67 | Head | — | New Hampshire |
| 48 | Albion Lewis | 34 | Head | Mechanic Helper | Massachusetts |
| 49 | Dorothy Lewis | 33 | Wife | — | Massachusetts |
| 50 | Mary Elizabeth Lewis | 1 | Daughter | — | Massachusetts |
| 51 | James Quealy | 56 | Head | Carpenter & Painter | Irish Free State |
| 52 | Annie Quealy | 52 | Wife | — | Irish Free State |
| 53 | Mary Quealy | 17 | Daughter | — | Massachusetts |
| 54 | James Quealy | 15 | Son | — | Massachusetts |
| 55 | Mildred Quealy | 11 | Daughter | — | Massachusetts |
| 56 | Grace F Barry | 52 | Head | Clerk | New Hampshire |
| 57 | Agnes Barry | 59 | Sister | — | New Hampshire |
| 58 | Elizabeth Hollis | 73 | Head | — | England |
| 59 | Frederick Harris | 30 | Head | Ring Spinner | Massachusetts |
| 60 | Mary Harris THIS PERSON | 25 | Wife | — | Massachusetts |
| 61 | Frederick Harris | 7 | Son | — | Massachusetts |
| 62 | Robert Abbott Harris | 5 | Son | — | Massachusetts |
| 63 | Ralph Harris | 3 | Son | — | Massachusetts |
| 64 | Jesse Stouffer | 44 | Head | Chef | Massachusetts |
| 65 | Gertrude Stouffer | 44 | Wife | — | Massachusetts |
| 66 | William Stouffer | 16 | Son | — | Massachusetts |
| 67 | Virginia Stouffer | 14 | Daughter | — | Massachusetts |
| 68 | Carl Stouffer | 10 | Son | — | Massachusetts |
| 69 | Russell Stouffer | 5 | Son | — | Massachusetts |
| 70 | Willis K Cunliffe | 58 | Head | — | Canada-French |
| 71 | Leila Cunliffe | 42 | Wife | — | Massachusetts |
| 72 | Richard Arnold | 68 | Lodger | — | Massachusetts |
| 73 | Harry E Morrell | 55 | Head | Buyer | Maine |
| 74 | Josephine Morrell | 48 | Wife | — | Massachusetts |
| 75 | Rachel Mckinnon | 42 | Head | Curtain Stitcher | Canada-English |
| 76 | John Mckinnon | 20 | Nephew | Florist | Massachusetts |
| 77 | Margaret Mckinnon | 14 | Niece | — | Massachusetts |
| 78 | Harry H Hamblett | 65 | Head | — | Massachusetts |
| 79 | Flora F Hamblett | 57 | Wife | — | Massachusetts |
Pedigree Summary
Mary
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
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)