JL
John Lambert — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Frederick-County, Maryland
Our Model Tree links this John Lambert across the 1930 and 1940 US Censuses in Frederick-County, Maryland (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 9-person household.
Age 12
b. ~1928
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Frederick-County, Maryland |
| Surname | Lambert |
| Given Name | John D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 8, Liberty |
| 1935 Residence (County) | Frederick |
| Additional Details | |
| Highest Grade | H-1 |
| 1935 Residence | Same Place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Election District 8 Liberty |
| Est. Birth Year | ~1928 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Mary Lambert | Daughter | — | 14 | ~1926 |
| Grace Lambert | Daughter | — | 4 | ~1936 |
| Hazel Lambert | Daughter | — | 15 | ~1925 |
| Raymond Lambert | Head | — | 44 | ~1896 |
| Lawrence Lambert | Son | — | 2 | ~1938 |
| John Lambert | Son | — | 12 | ~1928 |
| Thomas Lambert | Son | — | 3 | ~1937 |
| Frank Lambert | Son | — | 7 | ~1933 |
| Mary Lambert | Spouse | — | 36 | ~1904 |
Census Appearances
1930
Frederick, Maryland
Son, age 2
Frederick, Maryland · implied b. ~1928 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lambert |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Frederick-County, Maryland
Son, age 12
Frederick-County, Maryland · implied b. ~1928 — 9 household members
| Surname | Lambert |
| Given Name | John D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 8, Liberty |
| 1935 Residence (County) | Frederick |
| Highest Grade | H-1 |
| 1935 Residence | Same Place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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 John Lambert across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Lambert
Son · 1940 · age 12 · b. ~1928 · Maryland
★ You are viewing this record
Sibling
Lawrence Lambert
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Lambert
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Grace Lambert
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hazel Lambert
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Lambert
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Lambert
Sibling · 1940 · age 14
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 — Frederick-County, Maryland
Open full size
1940 US Federal Census — Frederick-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01549-00033)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Helen L. Danner | 23 | Wife | — | Maryland |
| 2 | Kenneth A. Danner | 3 | Son | — | Maryland |
| 3 | Joseph R. Danner | 1 | Son | — | Maryland |
| 4 | Raymond S. Lambert | 44 | Head | Farmer | Maryland |
| 5 | Mary C. Lambert | 36 | Wife | — | Maryland |
| 6 | Hazel S. Lambert | 15 | Daughter | — | Maryland |
| 7 | Mary H. Lambert | 14 | Daughter | — | Maryland |
| 8 | John D. Lambert THIS PERSON | 12 | Son | — | Maryland |
| 9 | Frank R. Lambert | 7 | Son | — | Maryland |
| 10 | Grace M. Lambert | 4 | Daughter | — | Maryland |
| 11 | Thomas H. Lambert | 3 | Son | — | Maryland |
| 12 | Lawrence Y. Lambert | 2 | Son | — | Maryland |
| 13 | Glenn H. Burgess | 30 | Head | Laborer | Virginia |
| 14 | Rosa J. Burgess | 27 | Wife | — | Virginia |
| 15 | Beula M. Burgess | 10 | Daughter | — | Pennsylvania |
| 16 | John L. Burgess | 9 | Son | — | Pennsylvania |
| 17 | Mary D. Burgess | 7 | Daughter | — | Maryland |
| 18 | Alice J. Burgess | 5 | Daughter | — | Maryland |
| 19 | Della J. Burgess | 4 | Daughter | — | Maryland |
| 20 | Harry W. Burgess | 1 | Son | — | Maryland |
| 21 | John L. Smith | 51 | Head | Farmer | Maryland |
| 22 | Jessie H. Smith | 51 | Wife | — | Maryland |
| 23 | W. Lee Smith | 26 | Son | Laborer | Maryland |
| 24 | Catherine G. Smith | 22 | Daughter | Making Shoes | Maryland |
| 25 | Sam L. Smith | 20 | Son | Laborer | Maryland |
| 26 | Florence A. Smith | 17 | Daughter | — | Maryland |
| 27 | Mary V. Smith | 16 | Daughter | — | Maryland |
| 28 | Winfield H. Smith | 12 | Son | — | Maryland |
| 29 | John H. Smith | 14 | Son | — | Maryland |
| 30 | Cora G. Smith | 10 | Daughter | — | Maryland |
| 31 | Paul Smith | 3 | Grandson | — | Maryland |
| 32 | John W. Albaugh | 47 | Head | Farmer | Maryland |
| 33 | Edna L. Albaugh | 47 | Wife | — | Maryland |
| 34 | John H. Jr. Albaugh | 17 | Son | Laborer | Maryland |
| 35 | Ira M. Garber | 51 | Head | Farmer | Maryland |
| 36 | Pearl M. Garber | 49 | Wife | — | Maryland |
| 37 | G. Russell Garber | 21 | Son | — | Maryland |
| 38 | Melvin M. Garber | 18 | Son | Laborer | Maryland |
| 39 | C. Virginia Garber | 12 | Granddaughter | — | Maryland |
| 40 | Glenda L. Garber | 10 | Granddaughter | — | Maryland |
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)