WM
William Mullen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this William Mullen across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1927), then head of a 9-person household.
Age 13
b. ~1927
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Mullen |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Industry | 0 |
| Highest Grade | 4 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston |
| Est. Birth Year | ~1927 |
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 |
|---|---|---|---|---|
| Joseph Mullen | Head | — | 39 | ~1901 |
| Gertrude Mullen | Daughter | — | 3 | ~1937 |
| Joseph Mullen | Son | — | 14 | ~1926 |
| William Mullen | Son | — | 13 | ~1927 |
| Frances Mullen | Daughter | — | 7 | ~1933 |
| Frances Mullen | Spouse | — | 39 | ~1901 |
| Priscilla Mullen | Daughter | — | 16 | ~1924 |
| Patricia Mullen | Daughter | — | 16 | ~1924 |
| Richard Mullen | Son | — | 8 | ~1932 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 3
Suffolk, Massachusetts · implied b. ~1927 — 14 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mellen |
| Given Name | William E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 13
Suffolk-County, Massachusetts · implied b. ~1927 — 9 household members
| Surname | Mullen |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Industry | 0 |
| Highest Grade | 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 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 13 · b. ~1927 · Massachusetts
★ You are viewing this record
Sibling
Richard Mullen
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Mullen
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gertrude Mullen
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Mullen
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Mullen
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Priscilla Mullen
Sibling · 1940 · age 16
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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01677-00095)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Constance Busch | 15 | Daughter | — | Pennsylvania |
| 42 | Jean Busch | 9 | Daughter | — | Massachusetts |
| 43 | John J. O'Brien | 46 | Head | Inspector | Massachusetts |
| 44 | Genevieve M. O'Brien | 47 | Wife | — | Massachusetts |
| 45 | John J. Jr. O'Brien | 16 | Son | — | Massachusetts |
| 46 | Shirley M. O'Brien | 14 | Daughter | — | Massachusetts |
| 47 | Genevieve O'Brien | 12 | Daughter | — | Massachusetts |
| 48 | Robert O'Brien | 8 | Son | — | Massachusetts |
| 50 | Joseph J. Mullen | 39 | Head | Clerk | Massachusetts |
| 51 | Frances H. Mullen | 39 | Wife | — | Massachusetts |
| 52 | Priscilla Mullen | 16 | Daughter | — | Massachusetts |
| 53 | Patricia Mullen | 16 | Daughter | — | Massachusetts |
| 54 | Joseph J. Jr. Mullen | 14 | Son | — | Massachusetts |
| 55 | William Mullen THIS PERSON | 13 | Son | — | Massachusetts |
| 56 | Richard F. Mullen | 8 | Son | — | Massachusetts |
| 57 | Frances M. Mullen | 7 | Daughter | — | Massachusetts |
| 58 | Gertrude K. Mullen | 3 | Daughter | — | Massachusetts |
| 59 | Bertha E. Ledair | 71 | Head | — | Massachusetts |
| 60 | Eldred Ledair | 39 | Son | Police Officer | Massachusetts |
| 61 | John J. Harrington | 40 | Head | Clerk | Massachusetts |
| 62 | Mildred M. Harrington | 32 | Wife | — | Massachusetts |
| 63 | Mildred Harrington | 7 | Daughter | — | Massachusetts |
| 64 | Madeline Harrington | 6 | Daughter | — | Massachusetts |
| 65 | Marjorie Harrington | 3 | Daughter | — | Massachusetts |
| 66 | Mary Joyce | 61 | Mother-in-law | — | Massachusetts |
| 67 | Patrick J. Lally | 56 | Head | Estimator | England |
| 68 | Henry Lally | 30 | Son | Electrician | Massachusetts |
| 69 | Herbert Lally | 21 | Son | Laborer | Massachusetts |
| 70 | Walter Lally | 20 | Son | — | Massachusetts |
| 71 | Delia Kilcoune | 61 | Housekeeper | Housekeeper | Massachusetts |
| 72 | Alexander Macleod | 72 | Head | — | Scotland |
| 73 | Isabell E. Macleod | 40 | Daughter | Secretary | Massachusetts |
| 74 | Harold Macleod | 30 | Son | — | Massachusetts |
| 75 | Harold Simpson | 52 | Head | Machinist | Massachusetts |
| 76 | Dorothy Simpson | 43 | Wife | — | England |
| 77 | Charles Simpson | 22 | Son | — | Massachusetts |
| 78 | John Simpson | 19 | Son | — | Massachusetts |
| 79 | Carol Simpson | 6 | Daughter | — | Massachusetts |
| 80 | Warren G. Connell | 29 | Head | Machine Operator | 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)