JG
John Griffith — 1940 US Census Record
Model Tree available1940 United States Federal Census · Frederick-County, Maryland
Our Model Tree links this John Griffith across the 1920, 1930 and 1940 US Censuses in Frederick-County, Maryland (XGBoost, ~Confirmed), with identified parents Charles & Edna — first a son (b.~1910), then head of a 4-person household.
Age 30
b. ~1910
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Frederick-County, Maryland |
| Surname | Griffith |
| Given Name | John O. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (County) | Frederick |
| Additional Details | |
| Occupation | Farm |
| Industry | PW |
| Class of Worker | 70 |
| Highest Grade | No 6 |
| 1935 Residence | 20 |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Farm |
| Township / Ward | Election District 19 |
| 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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Charles Griffith | Head | — | 67 | ~1873 |
| Carroll Griffith | Son | — | 27 | ~1913 |
| John Griffith | Son | — | 30 | ~1910 |
| Edna Griffith | Spouse | — | 67 | ~1873 |
Census Appearances
1920
Frederick, Maryland
Son, age 11
Frederick, Maryland · implied b. ~1909 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffith |
| Given Name | John G |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Frederick, Maryland
Son, age 21
Frederick, Maryland · implied b. ~1909 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffith |
| Given Name | John E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 21 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Frederick-County, Maryland
Son, age 30
Frederick-County, Maryland · implied b. ~1910 — 4 household members
| Surname | Griffith |
| Given Name | John O. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (County) | Frederick |
| Occupation | Farm |
| Industry | PW |
| Class of Worker | 70 |
| Highest Grade | No 6 |
| 1935 Residence | 20 |
| 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 Griffith across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Charles Griffith (~0.92 confidence) and mother Edna Griffith (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Charles Griffith
b. ~1873
Source father
● Household
· direct · ~0.92
Mother
Edna Griffith
b. ~1873
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Griffith
Son · 1940 · age 30 · b. ~1910 · Maryland
★ You are viewing this record
Sibling
Carroll Griffith
Sibling · 1940 · age 27
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-t0627-01549-00492)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Betty Jane Hamilton | 1 | Daughter | — | Maryland |
| 42 | Robert L. Hamilton | 0 | Son | — | Maryland |
| 43 | John W. Smith | 26 | Head | Farm | Maryland |
| 44 | Ruth I. Smith | 32 | Wife | — | Maryland |
| 45 | Roy R. Rippeon | 13 | Son | — | Maryland |
| 46 | Harry R. Fritz | 43 | Head | Road Construction | Maryland |
| 47 | Jessie K. Fritz | 27 | Wife | — | Maryland |
| 48 | Leo S. Fritz | 21 | Son | Farm | Maryland |
| 49 | Donald E. Fritz | 9 | Son | — | Maryland |
| 50 | Elsie M. Fritz | 7 | Daughter | — | Maryland |
| 51 | Harry B. Fritz | 5 | Son | — | Maryland |
| 52 | Robert L. Fritz | 2 | Son | — | Maryland |
| 53 | William W. Fritz | 0 | Son | — | Maryland |
| 54 | Harry A. Stitely | 62 | Head | Farm | Maryland |
| 55 | Mary E. Stitely | 50 | Wife | — | Maryland |
| 56 | Ernest A. Stitely | 16 | Son | Farm | Maryland |
| 57 | Lawrence A. Stitely | 15 | Son | Farm | Maryland |
| 58 | Mildred C. Stitely | 12 | Daughter | — | Maryland |
| 59 | Clarence A. Zeigler | 50 | Son in law | Farm | Maryland |
| 60 | Helen A. Zeigler | 21 | Daughter | — | Maryland |
| 61 | Harry A. Zeigler | 4 | Grandson | — | Maryland |
| 62 | William H. Purdum | 60 | Head | Farm | Maryland |
| 63 | Bessie R. Purdum | 53 | Wife | — | Maryland |
| 64 | Gilbert M. Purdum | 34 | Son | Farm | Maryland |
| 65 | Dorothy J. Purdum | 12 | Daughter | — | Maryland |
| 66 | William E. Purdum | 9 | Son | — | Maryland |
| 67 | Monroe V. Black | 31 | Head | Farm | Maryland |
| 68 | Charlotte L. Black | 27 | Wife | — | Maryland |
| 69 | Monroe S. Black | 6 | Son | — | Maryland |
| 70 | James F. Burdette | 70 | Head | Farm | Maryland |
| 71 | Charles A. Griffith | 67 | Head | Farm | Maryland |
| 72 | Edna G. Griffith | 67 | Wife | — | Maryland |
| 73 | John O. Griffith THIS PERSON | 30 | Son | Farm | Maryland |
| 74 | Carroll S. Griffith | 27 | Son | Farm | Maryland |
| 75 | Hobart M. Coon | 36 | Head | Farm | Maryland |
| 76 | Katherine E. Coon | 24 | Wife | — | Maryland |
| 77 | Shirley Ann Coon | 1 | Daughter | — | Maryland |
| 78 | James W. Barnes | 32 | Head | Farm | Maryland |
| 79 | Rose J. Barnes | 30 | Wife | — | Maryland |
| 80 | Robert J. Barnes | 6 | Son | — | Maryland |
Related Census Records
Pedigree Summary
John + 1 sibling
Gen 1 · 2 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)