WM
William Mullen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this William Mullen across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 9-person household.
Age 17
b. ~1923
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Mullen |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Woburn city |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H-1 |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Woburn City |
| Est. Birth Year | ~1923 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| John Mullen | Son | — | 23 | ~1917 |
| Joseph Mullen | Son | — | 22 | ~1918 |
| Catherine Mullen | Spouse | — | 51 | ~1889 |
| James Mullen | Son | — | 11 | ~1929 |
| Martin Mullen | Head | — | 53 | ~1887 |
| Rita Mullen | Daughter | — | 15 | ~1925 |
| William Mullen | Son | — | 17 | ~1923 |
| Catherine Mullen | Daughter | — | 15 | ~1925 |
| Mary Mullen | Daughter | — | 19 | ~1921 |
Census Appearances
1930
Middlesex, Massachusetts
Other, age 7
Middlesex, Massachusetts · implied b. ~1923 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mullens |
| Given Name | William |
| Relationship to Head | Boarder |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Age at First Marriage | W |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Home Value / Rent | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 17
Middlesex-County, Massachusetts · implied b. ~1923 — 9 household members
| Surname | Mullen |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Woburn city |
| Income (1939) | 0 |
| Highest Grade | H-1 |
| 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 Mullen across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Mullen
Son · 1940 · age 17 · b. ~1923 · Massachusetts
★ You are viewing this record
Sibling
James Mullen
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mullen
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Mullen
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Mullen
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Mullen
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mullen
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
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-t0627-01622-00590)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Francis Wynn | 19 | Son | Packer | Massachusetts |
| 2 | William Elson | 43 | Head | Florist | Massachusetts |
| 3 | Daphne Elson | 42 | Wife | — | Massachusetts |
| 4 | Earle Elson | 14 | Son | — | Massachusetts |
| 5 | Robert Elson | 9 | Son | — | Massachusetts |
| 6 | Paul Elson | 4 | Son | — | Massachusetts |
| 7 | Norma Leggett | 40 | Sister-in-law | Secretary | Massachusetts |
| 8 | Betty Leggett | 17 | Niece | — | Massachusetts |
| 9 | John Peterson | 69 | Head | Carpenter | Sweden |
| 10 | Catherine Peterson | 38 | Wife | — | Massachusetts |
| 11 | John Jr. Peterson | 7 | Son | — | Massachusetts |
| 12 | Joseph Peterson | 6 | Son | — | Massachusetts |
| 13 | Rita Peterson | 4 | Daughter | — | Massachusetts |
| 14 | George Mylott | 64 | Head | Janitor | New York |
| 15 | Mary E. Mylott | 67 | Wife | — | Massachusetts |
| 16 | Elizabeth Long | 60 | Lodger | Laborer | Massachusetts |
| 17 | Thomas Hamilton | 51 | Head | Clerk | Massachusetts |
| 18 | Mary E. Hamilton | 53 | Wife | — | Ireland |
| 19 | Mary E. Hamilton | 24 | Daughter | Bookkeeper | Massachusetts |
| 20 | David C. Hamilton | 19 | Son | — | Massachusetts |
| 21 | Margaret Hamilton | 18 | Daughter | — | Massachusetts |
| 22 | Francis B. Hamilton | 17 | Son | — | Massachusetts |
| 23 | Ann D. Hamilton | 16 | Daughter | — | Massachusetts |
| 24 | Martin Mullen | 53 | Head | Coater | Ireland |
| 25 | Catherine Mullen | 51 | Wife | — | Ireland |
| 26 | John P. Mullen | 23 | Son | Fireman | Massachusetts |
| 27 | Joseph Mullen | 22 | Son | Truck Driver | Massachusetts |
| 28 | Mary Mullen | 19 | Daughter | Cutter | Massachusetts |
| 29 | William Mullen THIS PERSON | 17 | Son | — | Massachusetts |
| 30 | Catherine Mullen | 15 | Daughter | — | Massachusetts |
| 31 | Rita Mullen | 15 | Daughter | — | Massachusetts |
| 32 | James Mullen | 11 | Son | — | Massachusetts |
| 33 | John Foster | 64 | Head | Mason | Holland |
| 34 | Nellie Foster | 46 | Wife | — | Holland |
| 35 | Ann Foster | 27 | Daughter | Waitress | New York |
| 36 | Gerarda Foster | 23 | Daughter | Waitress | Massachusetts |
| 37 | John Foster | 15 | Son | — | Massachusetts |
| 38 | Richard Foster | 5 | Son | — | Massachusetts |
| 39 | Herbert Dunn | 50 | Lodger | Bookkeeper | Massachusetts |
| 40 | Mary L. Dunn | 67 | Lodger | — | 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)