FJ
Frederick Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Frederick Johnson across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1909), then head of a 4-person household.
Age 31
b. ~1909
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Johnson |
| Given Name | Frederick W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| 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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Frederick | Age | Birth yr |
|---|---|---|---|---|
| Frederick Johnson | Son | — | 31 | ~1909 |
| John Johnson | Head | — | 67 | ~1873 |
| Natalie Johnson | Spouse | — | 54 | ~1886 |
| Natalie Johnson | Daughter | — | 21 | ~1919 |
Census Appearances
1920
Suffolk, Massachusetts
Son, age 11
Suffolk, Massachusetts · implied b. ~1909 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Frederick W |
| 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
Suffolk, Massachusetts
Son, age 21
Suffolk, Massachusetts · implied b. ~1909 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Frederick M |
| 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 | draftsman |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 31
Suffolk-County, Massachusetts · implied b. ~1909 — 4 household members
| Surname | Johnson |
| Given Name | Frederick W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Income (1939) | 0 |
| Highest Grade | C 1 |
| 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 Frederick Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Johnson (~0.92 confidence) and father John Johnson (~0.92 confidence) and mother Natalie Johnson (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Johnson
b. ~1873
Source father
● Household
· direct · ~0.92
Father
John Johnson
b. ~1874
Source father
● Household
· direct · ~0.92
Mother
Natalie Johnson
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Frederick Johnson
Son · 1940 · age 31 · b. ~1909 · Massachusetts
★ You are viewing this record
Sibling
Natalie Johnson
Sibling · 1940 · age 21
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
40 people indexed on this census page (nara:1940:m-t0627-01680-00892)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Josephine Pearson | 62 | Wife | — | Sweden |
| 2 | Helen I. Pearson | 22 | Daughter | Office Clerk | Massachusetts |
| 3 | Robert G. Pearson | 19 | Son | Assistant Student | Massachusetts |
| 4 | Raymond K. Hallgren | 29 | Head | Tool Maker | Connecticut |
| 5 | Ruth E. Hallgren | 25 | Wife | — | Massachusetts |
| 6 | Roger M. Hallgren | 1 | Son | — | Massachusetts |
| 7 | Percy W. Jenkins | 52 | Head | Auto Mechanic | New Hampshire |
| 8 | Jessie N. Jenkins | 65 | Wife | — | Canada-English |
| 9 | John H. Johnson | 67 | Head | Fire Lieutenant | Sweden |
| 10 | Natalie Johnson | 54 | Wife | — | Sweden |
| 11 | Frederick W. Johnson THIS PERSON | 31 | Son | — | Massachusetts |
| 12 | Natalie M. Johnson | 21 | Daughter | Asst Cooking Teacher | Massachusetts |
| 13 | Theodore W. Johnson | 27 | Head | Service Man | Massachusetts |
| 14 | Nellie A. Johnson | 25 | Wife | — | Massachusetts |
| 15 | Theodore W. Johnson | 1 | Son | — | Massachusetts |
| 16 | Robert H. Johnson | 0 | Son | — | Massachusetts |
| 17 | — | None | — | — | — |
| 18 | Adolphe J. Billotte | 45 | Head | Fireman | New York |
| 19 | Anna B. Billotte | 42 | Wife | Telephone Operator | Massachusetts |
| 20 | Anna B. Billotte | 18 | Daughter | — | Massachusetts |
| 21 | Adolph J. Jr. Billotte | 17 | Son | — | Massachusetts |
| 22 | Richard P. Billotte | 15 | Son | — | Massachusetts |
| 23 | Walter B. Gray | 42 | Head | Chauffeur | Maine |
| 24 | Anna M. Gray | 36 | Wife | — | Newfoundland |
| 25 | David W. Gray | 12 | Son | — | Massachusetts |
| 26 | Robert H. Gray | 45 | Brother | Blacksmith | Maine |
| 27 | Ralph R. Caldwell | 51 | Head | Oiler | Canada-English |
| 28 | Julia S. Caldwell | 46 | Wife | — | Massachusetts |
| 29 | Margaret S. Caldwell | 19 | Daughter | Clerk Teller | Massachusetts |
| 30 | Ralph R. Jr. Caldwell | 17 | Son | — | Massachusetts |
| 31 | Barbara J. Caldwell | 12 | Daughter | — | Massachusetts |
| 32 | August Zepp | 67 | Head | Orthopedic Technician | Germany |
| 33 | Juliana E. Zepp | 48 | Wife | — | Germany |
| 34 | Edmund J. Zepp | 28 | Son | Drug Clerk | Massachusetts |
| 35 | Lloyd L. Stickney | 46 | Head | Superintendent | Massachusetts |
| 36 | Marion W. Stickney | 47 | Wife | — | Massachusetts |
| 37 | Kenneth Stickney | 13 | Son | — | Massachusetts |
| 38 | Charles W. Creaser | 46 | Head | Power Engr. | Vermont |
| 39 | Mollie H. Creaser | 44 | Wife | Stitcher | Pennsylvania |
| 40 | Charles W. Jr. Creaser | 19 | Son | Truck Driver | Vermont |
Pedigree Summary
Frederick + 1 sibling
Gen 1 · 3 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)