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Frederick Williams — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Frederick Williams across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 9-person household.
Age 15
b. ~1925
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Williams |
| Given Name | Frederick C |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden (city) |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | Yes 7 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Malden City |
| Est. Birth Year | ~1925 |
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 Frederick | Age | Birth yr |
|---|---|---|---|---|
| Reuben Williams | Head | — | 56 | ~1884 |
| Mary Williams | Daughter | — | 17 | ~1923 |
| William Williams | Son | — | 24 | ~1916 |
| Kenneth Williams | Son | — | 9 | ~1931 |
| Gloria Williams | Daughter | — | 7 | ~1933 |
| Frederick Williams | Son | — | 15 | ~1925 |
| Emily Williams | Spouse | — | 46 | ~1894 |
| George Williams | Son | — | 12 | ~1928 |
| Robert Williams | Son | — | 20 | ~1920 |
Census Appearances
1930
Middlesex, Massachusetts
Son, age 5
Middlesex, Massachusetts · implied b. ~1925 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williams |
| Given Name | Frederick |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 15
Middlesex-County, Massachusetts · implied b. ~1925 — 9 household members
| Surname | Williams |
| Given Name | Frederick C |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden (city) |
| 1935 Residence (County) | Middlesex |
| Highest Grade | Yes 7 |
| 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 Frederick Williams across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Frederick Williams
Son · 1940 · age 15 · b. ~1925 · Massachusetts
★ You are viewing this record
Sibling
Kenneth Williams
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Williams
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Williams
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gloria Williams
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Williams
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Williams
Sibling · 1940 · age 20
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-t0627-01609-00354)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Irvine J Hunter | 23 | Son | Distributor | Canada-English |
| 2 | John D Hunter | 21 | Son | Clerk | Canada-English |
| 3 | Michael J Downing | 44 | Head | Machinist | Massachusetts |
| 4 | Mary E Downing | 34 | Wife | — | Canada-English |
| 5 | Irene M Downing | 13 | Daughter | — | Massachusetts |
| 6 | Joseph Downing | 12 | Son | — | Massachusetts |
| 7 | George Downing | 10 | Son | — | Massachusetts |
| 8 | Delbert F Downing | 8 | Son | — | Massachusetts |
| 9 | James W Downing | 6 | Son | — | Massachusetts |
| 10 | Walter M Cameron | 64 | Head | Laborer | Canada-English |
| 11 | Helen A Cameron | 46 | Wife | — | Massachusetts |
| 12 | James A Cameron | 47 | Cousin | — | Canada-English |
| 13 | Thomas P Morris | 41 | Head | Laborer | Massachusetts |
| 14 | Mildred C Morris | 38 | Wife | — | Massachusetts |
| 15 | Thomas W Morris | 7 | Son | — | Massachusetts |
| 16 | Robert E Morris | 5 | Son | — | Massachusetts |
| 17 | Francis J Morris | 2 | Son | — | Massachusetts |
| 18 | James L Brennan | 39 | Head | Manager | England |
| 19 | Helen A Brennan | 38 | Wife | Salesgirl | Massachusetts |
| 20 | Patricia A King | 3 | Niece | — | Massachusetts |
| 21 | Joseph M Brennan | 66 | Head | — | England |
| 22 | Margaret J Brennan | 60 | Wife | — | England |
| 23 | Arthur J Brennan | 31 | Son | Laborer | Massachusetts |
| 24 | Margaret L Brennan | 18 | Daughter | Salesgirl | Massachusetts |
| 25 | Reuben S Williams | 56 | Head | — | Canada-English |
| 26 | Emily P Williams | 46 | Wife | — | Massachusetts |
| 27 | William W Williams | 24 | Son | Installing Pumps | Massachusetts |
| 28 | Robert F Williams | 20 | Son | Laborer | Massachusetts |
| 29 | Mary P Williams | 17 | Daughter | — | Massachusetts |
| 30 | Frederick C Williams THIS PERSON | 15 | Son | — | Massachusetts |
| 31 | George E Williams | 12 | Son | — | Massachusetts |
| 32 | Kenneth S Williams | 9 | Son | — | Massachusetts |
| 33 | Gloria E Williams | 7 | Daughter | — | Massachusetts |
| 34 | Arvid D Larson | 32 | Head | Steeple Jack | Sweden |
| 35 | Kathleen M Larson | 34 | Wife | — | Massachusetts |
| 36 | Paul J Lacey | 17 | Step-son | — | Massachusetts |
| 37 | Alice B Lacey | 16 | Step-daughter | — | Massachusetts |
| 38 | Stanley W Lacey | 14 | Step-son | — | Massachusetts |
| 39 | Marjorie M Lacey | 13 | Step-daughter | — | Massachusetts |
| 40 | Muriel G Lacey | 11 | Step-daughter | — | 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)