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Theodore Anderson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Theodore Anderson across the 1910, 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Carl & Carl — first a son (b.~1909), then head of a 3-person household.
Age 31
b. ~1909
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Anderson |
| Given Name | Theodore G. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | BELMONT |
| 1935 Residence (County) | MIDDLESEX |
| Additional Details | |
| Occupation | Clerk |
| Industry | Insurance |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1480 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Clerk |
| Township / Ward | Belmont |
| 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Theodore | Age | Birth yr |
|---|---|---|---|---|
| Carl Anderson | Head | — | 60 | ~1880 |
| Theodore Anderson | Son | — | 31 | ~1909 |
| Otelia Anderson | Spouse | — | 60 | ~1880 |
Census Appearances
1910
Middlesex, Massachusetts
Son, age 1
Middlesex, Massachusetts · implied b. ~1909 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Anderson |
| Given Name | Theodore |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1920
Middlesex, Massachusetts
Son, age 11
Middlesex, Massachusetts · implied b. ~1909 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Anderson |
| Given Name | Theodore Y. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 21
Middlesex, Massachusetts · implied b. ~1909 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Anderson |
| Given Name | Theodore |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Clerk |
| Industry | Depot |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 31
Middlesex-County, Massachusetts · implied b. ~1909 — 3 household members
| Surname | Anderson |
| Given Name | Theodore G. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | BELMONT |
| 1935 Residence (County) | MIDDLESEX |
| Occupation | Clerk |
| Industry | Insurance |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1480 |
| Highest Grade | H-4 |
| 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 Theodore Anderson across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Carl Anderson (~0.92 confidence) and father Carl Anderson (~0.92 confidence) and father Carl Anderson (~0.92 confidence) and mother Anna Anderson (~0.92 confidence) and mother Cecelia Anderson (~0.92 confidence) and mother Hilda Anderson (~0.92 confidence) and mother Otelia Anderson (~0.92 confidence). The pedigree spans 1 generation with 7 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Carl Anderson
b. ~1879
Source father
● Household
· direct · ~0.92
Father
Carl Anderson
b. ~1880
Source father
● Household
· direct · ~0.92
Father
Carl Anderson
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Anna Anderson
b. ~1878
Source mother
● Household
· direct · ~0.92
Mother
Cecelia Anderson
b. ~1880
Source mother
● Household
· direct · ~0.92
Mother
Hilda Anderson
b. ~1880
Source mother
● Household
· direct · ~0.92
Mother
Otelia Anderson
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Theodore Anderson
Son · 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-t0627-01602-00908)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Thomas F Conroy | 50 | Head | Shipper | Massachusetts |
| 42 | Lillian V Conroy | 40 | Wife | Cashier | Massachusetts |
| 43 | John G Weatherbee | 44 | Head | Clerk | Massachusetts |
| 44 | Julia S Weatherbee | 39 | Wife | — | Massachusetts |
| 45 | Helen Ann Weatherbee | 9 | Daughter | — | Massachusetts |
| 46 | Axel M. Carlson | 42 | Head | Broker | Sweden |
| 47 | Mary K. Carlson | 41 | Wife | — | Massachusetts |
| 48 | Virginia M. Carlson | 11 | Daughter | — | Massachusetts |
| 49 | Paulina Scheffer | 74 | Head | — | Germany |
| 50 | Emma Scheffer | 48 | Daughter | Maid | Massachusetts |
| 51 | Ernest F Mckay | 32 | Head | Service Man | Massachusetts |
| 52 | Gladys Mckay | 30 | Wife | — | Massachusetts |
| 53 | Marilyn Mckay | 6 | Daughter | — | Massachusetts |
| 54 | Janice C. Mckay | 3 | Daughter | — | Massachusetts |
| 55 | William J Mitchell | 39 | Head | Bookkeeper | New York |
| 56 | Gladys A Mitchell | 37 | Wife | — | Massachusetts |
| 57 | William Mitchell | 9 | Son | — | Massachusetts |
| 58 | Virginia E Mitchell | 7 | Daughter | — | Massachusetts |
| 59 | Michael J Coughlin | 48 | Head | Clerk | Massachusetts |
| 60 | Alice G. Coughlin | 47 | Wife | — | Massachusetts |
| 61 | Joseph S. Coughlin | 8 | Son | — | Massachusetts |
| 62 | Mary A Coughlin | 7 | Daughter | — | Massachusetts |
| 63 | John R Munroe | 45 | Head | Barber | Canada |
| 64 | Olive Helen Munroe | 50 | Wife | — | Canada |
| 65 | Sadie Clarke | 18 | Niece | — | Canada |
| 66 | George Hughes | 30 | Head | Inspector | Massachusetts |
| 67 | Evelyn Hughes | 31 | Wife | — | Massachusetts |
| 68 | E. Wayne Donalson | 44 | Head | Owner | Canada |
| 69 | Ethel Donalson | 48 | Wife | — | Massachusetts |
| 70 | Louis Mcdonnell | 28 | Head | Office Manager | Massachusetts |
| 71 | Selma Mcdonnell | 32 | Wife | Secretary | Massachusetts |
| 72 | Carl G Anderson | 60 | Head | Repairman | Sweden |
| 73 | Otelia H Anderson | 60 | Wife | — | Sweden |
| 74 | Theodore G. Anderson THIS PERSON | 31 | Son | Clerk | Massachusetts |
| 75 | Mathilda Lipner | 85 | Head | — | Sweden |
| 76 | August Johnson | 65 | Head | Finisher | Sweden |
| 77 | Lina W Johnson | 60 | Wife | — | Pennsylvania |
| 78 | James T Conlon | 40 | Head | Manager | Massachusetts |
| 79 | Catherine Conlon | 39 | Wife | — | Massachusetts |
| 80 | Geraldine Conlon | 11 | Daughter | — | Massachusetts |
Pedigree Summary
Theodore
Gen 1 · 7 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)