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Leonard Brown — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Leonard Brown across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 9-person household.
Age 11
b. ~1929
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Brown |
| Given Name | Leonard |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Industry | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston |
| Est. Birth Year | ~1929 |
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 Leonard | Age | Birth yr |
|---|---|---|---|---|
| Lillian Brown | Daughter | — | 21 | ~1919 |
| Harry Brown | Head | — | 52 | ~1888 |
| Arthur Brown | Son | — | 3 | ~1937 |
| Emily Brown | Daughter | — | 9 | ~1931 |
| Joseph Brown | Son | — | 15 | ~1925 |
| Lillian Brown | Spouse | — | 50 | ~1890 |
| Leonard Brown | Son | — | 11 | ~1929 |
| Harry Brown | Son | — | 19 | ~1921 |
| Walter Brown | Son | — | 17 | ~1923 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 1
Suffolk, Massachusetts · implied b. ~1929 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brown |
| Given Name | Leonard |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| 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 11
Suffolk-County, Massachusetts · implied b. ~1929 — 9 household members
| Surname | Brown |
| Given Name | Leonard |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Industry | 0 |
| Highest Grade | No 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 Leonard Brown across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Leonard Brown
Son · 1940 · age 11 · b. ~1929 · Massachusetts
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Sibling
Joseph Brown
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Brown
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lillian Brown
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harry Brown
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Emily Brown
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arthur Brown
Sibling · 1940 · age 3
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-t0627-01682-00208)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ivari Kokko | 56 | Head | Iron Worker | Finland |
| 42 | Helma Kokko | 52 | Wife | — | Finland |
| 43 | Aita Kokko | 14 | Daughter | — | Massachusetts |
| 44 | William Reilly | 42 | Head | Foreman | Massachusetts |
| 45 | Mary E. Reilly | 37 | Wife | — | Massachusetts |
| 46 | Gertrude Reilly | 21 | Daughter | Machine Operator | Massachusetts |
| 47 | Maria Reilly | 17 | Daughter | — | Massachusetts |
| 48 | William J. Reilly | 15 | Son | — | Massachusetts |
| 49 | James Reilly | 13 | Son | — | Massachusetts |
| 50 | Lillian Reilly | 10 | Daughter | — | Massachusetts |
| 51 | Francis Reilly | 8 | Son | — | Massachusetts |
| 52 | Mary E. Reilly | 68 | Head | — | Irish Free State |
| 53 | Mary A. Reilly | 38 | Daughter | Telephone Operator | Massachusetts |
| 54 | Patrick J. Reilly | 33 | Son | Attendant | Massachusetts |
| 55 | James Reilly | 30 | Son | Sheet Metal Worker | Massachusetts |
| 56 | Joseph Reilly | 27 | Son | New Worker | Massachusetts |
| 57 | Alfred Marsh | 45 | Head | Ice Dealer | Nova Scotia |
| 58 | Almeda Marsh | 41 | Wife | — | Nova Scotia |
| 59 | Leila Marsh | 17 | Daughter | — | Nova Scotia |
| 60 | Verna Marsh | 16 | Daughter | — | Nova Scotia |
| 61 | Vernon Marsh | 14 | Son | — | Nova Scotia |
| 62 | Edward Marsh | 3 | Son | — | Massachusetts |
| 63 | Harry S. Brown | 52 | Head | Millwright | Massachusetts |
| 64 | Lillian E. Brown | 50 | Wife | — | Massachusetts |
| 65 | Lillian Brown | 21 | Daughter | New Worker | Massachusetts |
| 66 | Harry W. Brown | 19 | Son | — | Massachusetts |
| 67 | Walter Brown | 17 | Son | Delivery Boy | Massachusetts |
| 68 | Joseph Brown | 15 | Son | — | Massachusetts |
| 69 | Leonard Brown THIS PERSON | 11 | Son | — | Massachusetts |
| 70 | Emily Brown | 9 | Daughter | — | Massachusetts |
| 71 | Arthur Brown | 3 | Son | — | Massachusetts |
| 72 | Catherine E. Denver | 61 | Head | — | Massachusetts |
| 73 | Herbert L. Brandall | 34 | Lodger | Service Man | Maine |
| 74 | Anna S. Brandall | 39 | Daughter | — | Massachusetts |
| 75 | George Fragges | 57 | Head | Laborer | Greece |
| 76 | Clara Fragges | 33 | Wife | — | Greece |
| 77 | Stephen Fragges | 27 | Son | Butcher | Greece |
| 78 | James Fragges | 22 | Son | Printer | Massachusetts |
| 79 | Charles Fragges | 19 | Son | Filling Station | Massachusetts |
| 80 | Louis Janakas | 45 | Head | Cook | Greece |
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)