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William Hayes — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this William Hayes across the 1910, 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents William & Jane — first a head (b.~1909), then head of a 5-person household.
Age 31
b. ~1909
Male
Head
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Hayes |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1909 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Mary Hayes | Daughter | — | 6 | ~1934 |
| William Hayes | Head | — | 31 | ~1909 |
| William Hayes | Son | — | 4 | ~1936 |
| Francis Hayes | Son | — | 1 | ~1939 |
| Catherine Hayes | Spouse | — | 25 | ~1915 |
Census Appearances
1910
Middlesex, Massachusetts
Son, age 1
Middlesex, Massachusetts · implied b. ~1909 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hayes |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1920
Middlesex, Massachusetts
Son, age 10
Middlesex, Massachusetts · implied b. ~1910 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hayes |
| Given Name | William F Jr |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| 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
Son, age 20
Middlesex, Massachusetts · implied b. ~1910 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hayes |
| Given Name | William F Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | mason |
| Industry | building cons. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Head, age 31
Middlesex-County, Massachusetts · implied b. ~1909 — 5 household members
| Surname | Hayes |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| 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 William Hayes across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father William Hayes (~0.92 confidence) and mother Jane Hayes (~0.92 confidence) and father William Hayes (~0.92 confidence) and mother Jane Hayes (~0.92 confidence) and mother Mary Hayes (~0.92 confidence) and father William Hayes (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
William Hayes
b. ~1872
Source father
● Household
· direct · ~0.92
Mother
Jane Hayes
b. ~1872
Source mother
● Household
· direct · ~0.92
Father
William Hayes
b. ~1873
Source father
● Household
· direct · ~0.92
Mother
Jane Hayes
b. ~1878
Source mother
● Household
· direct · ~0.92
Mother
Mary Hayes
b. ~1878
Source mother
● Household
· direct · ~0.92
Father
William Hayes
b. ~1879
Source father
● Household
· direct · ~0.92
This person
Anchor record
William Hayes
Head · 1940 · age 31 · b. ~1909 · 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
40 people indexed on this census page (nara:1940:m-t0627-01702-00163)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Edmund Burke | 46 | Head | Laborer | Massachusetts |
| 42 | Charles Burke | 14 | Son | — | Massachusetts |
| 43 | John M. Burke | 10 | Son | — | Massachusetts |
| 44 | Agnes Meaney | 40 | Sister | Operator | Massachusetts |
| 45 | James R. Johnson | 35 | Head | Assembler | Massachusetts |
| 46 | Catherine Johnson | 35 | Wife | — | Massachusetts |
| 47 | James Jr. Johnson | 9 | Son | — | Massachusetts |
| 48 | Harold Johnson | 7 | Son | — | Massachusetts |
| 49 | Grace Johnson | 6 | Daughter | — | Massachusetts |
| 50 | Hugh Macdonald | 70 | Father | — | England |
| 51 | Ellen Macdonald | 66 | Mother | — | Ireland (Eire) |
| 52 | Roy Gibson | 61 | Head | Armorer | Canada English |
| 53 | Elizabeth Gibson | 56 | Wife | — | Canada English |
| 54 | Gordon Gibson | 27 | Son | Chauffeur | Massachusetts |
| 55 | Reuben Gibson | 25 | Son | Maintenance | Massachusetts |
| 56 | Mary Hill | 69 | Lodger | Sales | Kentucky |
| 57 | Joseph Harrington | 45 | Lodger | — | Massachusetts |
| 58 | Lawrence Fitzpatrick | 29 | Lodger | Polisher | Maine |
| 59 | Charles Quinlan | 27 | Lodger | Chauffeur | Maine |
| 60 | Louis A. Ryan | 50 | Head | Chauffeur | Massachusetts |
| 61 | Margaret Ryan | 45 | Wife | Steam Fitter | Massachusetts |
| 62 | Ethel Ryan | 20 | Daughter | — | Massachusetts |
| 63 | Margaret Ryan | 17 | Daughter | Packer | Massachusetts |
| 64 | Louis Jr. Ryan | 12 | Son | — | Massachusetts |
| 65 | Paul Ryan | 10 | Son | — | Massachusetts |
| 66 | William Hayes THIS PERSON | 31 | Head | — | Massachusetts |
| 67 | Catherine Hayes | 25 | Wife | Electrician | Massachusetts |
| 68 | Mary Hayes | 6 | Daughter | — | Massachusetts |
| 69 | William Hayes | 4 | Son | — | Massachusetts |
| 70 | Francis Hayes | 1 | Son | — | Massachusetts |
| 71 | Frank Dwyer | 32 | Head | — | Massachusetts |
| 72 | Josephine Dwyer | 31 | Wife | Foreman | Massachusetts |
| 73 | Carolyn Dwyer | 8 | Daughter | — | Massachusetts |
| 74 | Janet Dwyer | 6 | Daughter | — | Massachusetts |
| 75 | Fred Bottcher | 41 | Head | — | Massachusetts |
| 76 | Anna Bottcher | 43 | Wife | Blacksmith | Massachusetts |
| 77 | Fred Jr. Bottcher | 21 | Son | — | Massachusetts |
| 78 | John Maccallum | 58 | Head | Helper | Canada English |
| 79 | Catherine Maccallum | 45 | Wife | Cutter | Scotland |
| 80 | Maccallum | None | — | — | — |
Pedigree Summary
William
Gen 1 · 6 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)