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William Davidson — 1930 US Census Record
Model Tree available1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this William Davidson across the 1910, 1920 and 1930 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed), with identified parents John & Catherine — first a son (b.~1910), then head of a 10-person household.
Age 20
b. ~1910
Male
Son
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Davidson |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Occupation | Clerk |
| Industry | Electric Light |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Clerk |
| Township / Ward | Cambridge City |
| Est. Birth Year | ~1910 |
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.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Helen Davidson | Daughter | — | 18 | ~1912 |
| Margaret Davidson | Daughter | — | 13 | ~1917 |
| John Davidson | Head | — | 43 | ~1887 |
| Josephine Davidson | Other | — | 42 | ~1888 |
| Paul Davidson | Son | — | 1 | ~1929 |
| Joseph Davidson | Son | — | 4 | ~1926 |
| William Davidson | Son | — | 20 | ~1910 |
| Thomas Davidson | Son | — | 15 | ~1915 |
| John Davidson | Son | — | 11 | ~1919 |
| David Davidson | Son | — | 7 | ~1923 |
Census Appearances
1910
Middlesex, Massachusetts
Son, age
Middlesex, Massachusetts · implied b. ~1910 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Davidson |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| 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 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Davidson |
| Given Name | William |
| 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 — 10 household members
| Surname | Davidson |
| Given Name | William |
| 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 | Clerk |
| Industry | Electric Light |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 Davidson across 3 US Census years (1910, 1920 and 1930) in Middlesex, Massachusetts, using XGBoost record linkage. Identified parents: father John Davidson (~0.92 confidence) and mother Catherine Davidson (~0.92 confidence) and father John Davidson (~0.92 confidence) and mother Katherine Davidson (~0.92 confidence) and father John Davidson (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Davidson
b. ~1886
Source father
● Household
· direct · ~0.92
Mother
Catherine Davidson
b. ~1887
Source mother
● Household
· direct · ~0.92
Father
John Davidson
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Katherine Davidson
b. ~1889
Source mother
● Household
· direct · ~0.92
Father
John Davidson
b. ~1890
Source father
● Household
· direct · ~0.92
This person
Anchor record
William Davidson
Son · 1930 · age 20 · b. ~1910 · Massachusetts
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Sibling
Helen Davidson
Sibling · 1930 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Davidson
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Davidson
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Davidson
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Davidson
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Davidson
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Davidson
Sibling · 1930 · age 15
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
1930 US Federal Census — Middlesex, Massachusetts
Open full size
1930 US Federal Census — Middlesex, Massachusetts
Page Contents
42 people indexed on this census page (ia:1930:massachusettscensus00reel916:0472)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mildred Brundige | 11 | Daughter | — | Massachusetts |
| 2 | William Brundige | 9 | Son | — | Massachusetts |
| 3 | Oliver Brundige | 7 | Son | — | Massachusetts |
| 4 | Douglas Brundige | 5 | Son | — | Massachusetts |
| 5 | John J Davidson | 43 | Head | Chauffeur | Massachusetts |
| 6 | Josephine A Davidson | 42 | Wife-H | — | Massachusetts |
| 7 | William Davidson THIS PERSON | 20 | Son | Clerk | Massachusetts |
| 8 | Helen Davidson | 18 | Daughter | Stenographer | Massachusetts |
| 9 | Thomas Davidson | 15 | Son | — | Massachusetts |
| 10 | Margaret Davidson | 13 | Daughter | — | Massachusetts |
| 11 | John Davidson | 11 | Son | — | Massachusetts |
| 12 | David Davidson | 7 | Son | — | Massachusetts |
| 13 | Joseph Davidson | 4 | Son | — | Massachusetts |
| 14 | Paul Davidson | 1 | Son | — | Massachusetts |
| 15 | James Austin | 35 | Head | Cook | Virginia |
| 16 | Annie S Austin | 30 | Wife-H | — | North Carolina |
| 17 | Thelma Austin | 2 | Daughter | — | Massachusetts |
| 18 | Peter Haywood | 37 | Head | Laborer | Barbados (B.W.I.) |
| 19 | Lillian Haywood | 36 | Wife-H | — | Massachusetts |
| 20 | Mabel Haywood | 7 | Daughter | — | Massachusetts |
| 21 | Leland Haywood | 5 | Son | — | Massachusetts |
| 22 | Louis J Haywood | 3 | Son | — | Massachusetts |
| 23 | Evelyn Haywood | 1 | Daughter | — | Massachusetts |
| 24 | Brotherton Haywood | 61 | Father | — | Barbados |
| 25 | John Diggs | 40 | Head | Meat Cutter | Virginia |
| 26 | Mabel Diggs | 31 | Wife-H | — | Virginia |
| 27 | Charles M Sands | 47 | Head-H | Manager | Kentucky |
| 28 | Francis G Hamilton | 28 | Head | Salesman | Massachusetts |
| 29 | Ellen M Hamilton | 25 | Wife-H | Cutter | Spain |
| 30 | Laura C Duffy | 27 | Head-H | Saleslady | Canada-English |
| 31 | Willie Vaughan | 59 | Lodger | Bookbinder | New York |
| 32 | Ella L Beatty | 52 | Head-H | Operator | Massachusetts |
| 33 | Willie Vaughan | 42 | Lodger | Mason | Canada-English |
| 34 | Keith W Rankin | 24 | Head | Mechanic | St. Lucia B.W.I. |
| 35 | Mabel L Rankin | 22 | Wife-H | — | Massachusetts |
| 36 | Keith W Jr Rankin | 3 | Son | — | Massachusetts |
| 37 | Wendell J Rankin | 1 | Son | — | Massachusetts |
| 38 | William H Rankin | 0 | Son | — | Massachusetts |
| 39 | Margaret Mary Harrison | 43 | Lodger | — | Connecticut |
| 40 | Harrison | None | — | — | — |
| 41 | Charles S Harrison | 51 | Head | Proprietor | Canada-English |
| 42 | Myrtle Blacquiere | 23 | Cousin-H | Waitress | Canada-English |
Pedigree Summary
William + 7 siblings
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)