MG
Mary Griffith — 1930 US Census Record
Model Tree available1930 United States Federal Census · Frederick, Maryland
Our Model Tree links this Mary Griffith across the 1910, 1920 and 1930 US Censuses in Frederick, Maryland (XGBoost, ~Confirmed), with identified parents Harry & Harry — first a daughter (b.~1910), then head of a 8-person household.
Age 20
b. ~1910
Female
Daughter
Born: Maryland
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Frederick, Maryland |
| Surname | Griffith |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Additional Details | |
| Occupation | Servant |
| Industry | Private Family |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Servant |
| Township / Ward | Liberty District 8 |
| 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.
8 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Marguerite Griffith | Daughter | — | 17 | ~1913 |
| Mary Griffith | Daughter | — | 20 | ~1910 |
| Harry Griffith | Head | — | 49 | ~1881 |
| June Griffith | Other | — | 40 | ~1890 |
| Clarence Griffith | Son | — | 23 | ~1907 |
| William Griffith | Son | — | 14 | ~1916 |
| Ralph Griffith | Son | — | 5 | ~1925 |
| Harry Griffith | Son | — | 8 | ~1922 |
Census Appearances
1910
Frederick, Maryland
Daughter, age 1
Frederick, Maryland · implied b. ~1909 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffith |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1920
Frederick, Maryland
Daughter, age 9
Frederick, Maryland · implied b. ~1911 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffith |
| Given Name | Mary A |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Frederick, Maryland
Daughter, age 20
Frederick, Maryland · implied b. ~1910 — 8 household members
| Surname | Griffith |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Servant |
| Industry | Private Family |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 Mary Griffith across 3 US Census years (1910, 1920 and 1930) in Frederick, Maryland, using XGBoost record linkage. Identified parents: father Harry Griffith (~0.92 confidence) and father Harry Griffith (~0.92 confidence) and mother Bessie Griffith (~0.92 confidence) and father Harry Griffith (~0.92 confidence) and mother Sarah Griffith (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Harry Griffith
b. ~1881
Source father
● Household
· direct · ~0.92
Father
Harry Griffith
b. ~1881
Source father
● Household
· direct · ~0.92
Mother
Bessie Griffith
b. ~1887
Source mother
● Household
· direct · ~0.92
Father
Harry Griffith
b. ~1888
Source father
● Household
· direct · ~0.92
Mother
Sarah Griffith
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Griffith
Daughter · 1930 · age 20 · b. ~1910 · Maryland
★ You are viewing this record
Sibling
Clarence Griffith
Sibling · 1930 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Griffith
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harry Griffith
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ralph Griffith
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marguerite Griffith
Sibling · 1930 · age 17
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
1930 US Federal Census — Frederick, Maryland
Open full size
1930 US Federal Census — Frederick, Maryland
Page Contents
50 people indexed on this census page (ia:1930:15thcensus874unit:0627)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Thomas H Valentine | 50 | Head | Farmer | Maryland |
| 2 | Effie M Valentine | 45 | Wife-H | — | Maryland |
| 3 | Ruth R Valentine | 17 | Daughter | — | Maryland |
| 4 | Jessie M Castann | 49 | Head | Farmer | Maryland |
| 5 | Ida H Castann | 45 | Wife-H | — | Maryland |
| 6 | Earl R Castann | 15 | Son | — | Maryland |
| 7 | Evelyn J Castann | 14 | Daughter | — | Maryland |
| 8 | Helena R Castann | 12 | Daughter | — | Maryland |
| 9 | Marie F Castann | 10 | Daughter | — | Maryland |
| 10 | Pearl R Castann | 6 | Daughter | — | Maryland |
| 11 | Charles Measell | 55 | Lodger | Laborer | Maryland |
| 12 | Harry E Justason | 47 | Head | — | Maryland |
| 13 | Arthur G Rippeon | 38 | Head | Assistant Foreman | Maryland |
| 14 | Iva E Rippeon | 33 | Wife-H | — | Virginia |
| 15 | Arthur G Jr Rippeon | 7 | Son | — | Maryland |
| 16 | Frank E Rippeon | 5 | Son | — | Maryland |
| 17 | Edith V Rippeon | 4 | Daughter | — | Maryland |
| 18 | Charlotte E Rippeon | 3 | Daughter | — | Maryland |
| 19 | Grayson E Rippeon | 2 | Son | — | Maryland |
| 20 | Sherman S Rippeon | 1 | Son | — | Maryland |
| 21 | John G Thompson | 32 | Head | Laborer | Maryland |
| 22 | Bessie E Thompson | 37 | Wife-H | — | Maryland |
| 23 | Ruby M Thompson | 11 | Daughter | — | Maryland |
| 24 | Helen E Thompson | 10 | Daughter | — | Maryland |
| 25 | Ethel M Thompson | 7 | Daughter | — | Maryland |
| 26 | William F Thompson | 7 | Son | — | Maryland |
| 27 | Ernest S Garber | 48 | Head | Chauffeur | Maryland |
| 28 | Mary A Garber | 47 | Wife-H | — | Maryland |
| 29 | John S Garber | 19 | Son | — | Maryland |
| 30 | Harry G Baird | 59 | Head | Farmer | Maryland |
| 31 | Raynold G Baird | 24 | Son | Laborer | Maryland |
| 32 | John R Baird | 22 | Son | Laborer | Maryland |
| 33 | Edith M Baird | 16 | Daughter | — | Maryland |
| 34 | Thelma F Baird | 15 | Son | — | Maryland |
| 35 | Leslie H Rippeon | 29 | Head | Laborer | Maryland |
| 36 | Margie M Rippeon | 25 | Wife-H | — | Maryland |
| 37 | Roy L Rippeon | 3 | Nephew | — | Maryland |
| 38 | Harvey M Rippeon | 38 | Head | Farmer | Maryland |
| 39 | May A Rippeon | 35 | Wife-H | — | Maryland |
| 40 | Margaret A Rippeon | 16 | Daughter | — | Maryland |
| 41 | Catherine Rippeon | 11 | Daughter | — | Maryland |
| 42 | Paul E Burrier | 9 | Nephew | — | Maryland |
| 43 | Harry Griffith | 49 | Head | Laborer | Maryland |
| 44 | June Griffith | 40 | Wife-H | — | Maryland |
| 45 | Clarence Griffith | 23 | Son | Laborer | Maryland |
| 46 | Mary Griffith THIS PERSON | 20 | Daughter | Servant | Maryland |
| 47 | Marguerite Griffith | 17 | Daughter | Servant | Maryland |
| 48 | William Griffith | 14 | Son | — | Maryland |
| 49 | Harry Jr Griffith | 8 | Son | — | Maryland |
| 50 | Ralph Griffith | 5 | Son | — | Maryland |
Pedigree Summary
Mary + 5 siblings
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)