RD
Ruby Davis — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Frederick, Maryland
Our Model Tree links this Ruby Davis across the 1930 and 1940 US Censuses in Frederick, Maryland (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 10-person household.
Age 9
b. ~1921
Female
Daughter
Born: Maryland
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Frederick, Maryland |
| Surname | Davis |
| Given Name | Ruby M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Additional Details | |
| Occupation | none |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | New Market District |
| Est. Birth Year | ~1921 |
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.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Ruby | Age | Birth yr |
|---|---|---|---|---|
| Ruby Davis | Daughter | — | 9 | ~1921 |
| Velma Davis | Daughter | — | 10 | ~1920 |
| William Davis | Daughter | — | 11 | ~1919 |
| Charles Davis | Head | — | 46 | ~1884 |
| Edith Davis | Other | — | 41 | ~1889 |
| Willard Davis | Son | — | 3 | ~1927 |
| Concord Davis | Son | — | 1 | ~1929 |
| Garrett Davis | Son | — | 6 | ~1924 |
| John Davis | Son | — | 13 | ~1917 |
| Charles Davis | Son | — | 21 | ~1909 |
Census Appearances
1930
Frederick, Maryland
Daughter, age 9
Frederick, Maryland · implied b. ~1921 — 10 household members
| Surname | Davis |
| Given Name | Ruby M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | none |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Frederick-County, Maryland
Daughter, age 19
Frederick-County, Maryland · implied b. ~1921 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Davis |
| Given Name | Ruth F. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Frederick City |
| 1935 Residence (County) | Frederick |
| Occupation | Typist |
| Industry | Court House |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 236 |
| Highest Grade | No 4 |
| 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 Ruby Davis across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Ruby Davis
Daughter · 1930 · age 9 · b. ~1921 · Maryland
★ You are viewing this record
Sibling
Willard Davis
Sibling · 1930 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Davis
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Garrett Davis
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Davis
Sibling · 1930 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Concord Davis
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Velma Davis
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Davis
Sibling · 1930 · age 11
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:0674)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Charles S. | 50 | Head | None | Maryland |
| 52 | Rudolph | 25 | Son | None | Maryland |
| 53 | William M. | 23 | Son | None | Maryland |
| 54 | John C. Hudson | 38 | Head | Laborer | Maryland |
| 55 | Mary L. Hudson | 30 | Wife-H | None | Maryland |
| 56 | Joseph M. Hudson | 8 | Son | None | Maryland |
| 57 | James M. Hudson | 3 | Son | None | Maryland |
| 58 | John L. Hudson | 1 | Son | None | Maryland |
| 59 | Philip S. Davis | 66 | Head | Laborer | Virginia |
| 60 | Annie B. Davis | 64 | Wife-H | None | Maryland |
| 61 | Charles W. Davis | 46 | Head | Butcher | Maryland |
| 62 | Edith Davis | 41 | Wife-H | None | Maryland |
| 63 | Charles F. Davis | 21 | Son | Laborer | Maryland |
| 64 | John O. Davis | 13 | Son | None | Maryland |
| 65 | William N. Davis | 11 | Daughter | None | Maryland |
| 66 | Velma M. Davis | 10 | Daughter | None | Maryland |
| 67 | Ruby M. Davis THIS PERSON | 9 | Daughter | None | Maryland |
| 68 | Garrett J. Davis | 6 | Son | None | Maryland |
| 69 | Willard B. Davis | 3 | Son | None | Maryland |
| 70 | Concord B. Davis | 1 | Son | None | Maryland |
| 71 | Jesse C. Lahery | 42 | Head | Farmer | Maryland |
| 72 | Della M. Lahery | 29 | Wife-H | None | Maryland |
| 73 | Margaret Lahery | 16 | Daughter | None | Maryland |
| 74 | Katherine Lahery | 17 | Daughter | Clerk | Maryland |
| 75 | Jesse D. Phelps | 46 | Head | Orchardist | Maryland |
| 76 | Lula M. Phelps | 37 | Wife-H | None | Maryland |
| 77 | Miriam V. Phelps | 17 | Daughter | Housekeeper | Maryland |
| 78 | Beatrice M. Phelps | 15 | Daughter | None | Maryland |
| 79 | Helen L. Phelps | 12 | Daughter | None | Maryland |
| 80 | Alice E. Phelps | 9 | Daughter | None | Maryland |
| 81 | Jesse T. Phelps | 7 | Son | None | Maryland |
| 82 | Nannie B. Bradley | 42 | Head-H | Farmer | Maryland |
| 83 | Bessie D. Bradley | 21 | Daughter | None | Maryland |
| 84 | Lula Grace M. Bradley | 16 | Daughter | None | Maryland |
| 85 | Robert J. Fitzgerald | 0 | Grandson | None | Maryland |
| 86 | Henry F. Smith | 54 | Head | Farmer | Maryland |
| 87 | Annie R. Smith | 35 | Wife-H | None | Maryland |
| 88 | Washington G. Smith | 18 | Son | Laborer | Maryland |
| 89 | Alton W. Smith | 14 | Son | None | Maryland |
| 90 | Ruth M. Smith | 12 | Daughter | None | Maryland |
| 91 | Agnes L. Smith | 9 | Daughter | None | Maryland |
| 92 | Steven Smith | 7 | Son | None | Maryland |
| 93 | Adelaide R. Smith | 4 | Daughter | None | Maryland |
| 94 | Maud M. Smith | 2 | Daughter | None | Maryland |
| 95 | Nicholas L. Smith | 1 | Son | None | Maryland |
| 96 | Albert A. Ensor | 55 | Head | Farmer | Maryland |
| 97 | Josephine H. Ensor | 54 | Wife-H | None | Maryland |
| 98 | Susannah Phelps | 65 | Head-H | None | Maryland |
| 99 | William D. Phelps | 42 | Son | Dyeing | Maryland |
| 100 | Louisa E. Phelps | 80 | Head-H | Farmer | Maryland |
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)