Primary Documents

Census Records

1840 Census for Johns Hopkins - Baltimore City

1850 Census for Johns Hopkins - Baltimore County - Free Inhabitant & Slave Schedule

1860 Census for Johns Hopkins - Baltimore County - Free Inhabitant Only

1870 Census for Johns Hopkins - Baltimore County - Free Inhabitant Only

Certificates of Freedom

Certificates of Freedom for Minty & Louisa - 1832 & 1838

Deeds

Deed of Manumission of Johns Hopkins the Elder - 1778 (external link)

Deed of Manumission for Minty & Louiza - 1832

Estate Inventories

Estate Inventory of Johns Hopkins the Elder - 1784

Notice of Estate Sale for Elizabeth Hopkins - 1804

Estate Inventory for Philip Hopkins - 1815

Estate Inventory for Samuel Hopkins - 1818 

Estate Inventory of Joseph J. Hopkins - 1845

Quaker Records

See the blogsite by Edward C. Papenfuse Remembering Baltimore

Wills

Last Will & Testament of Johns Hopkins the Elder - 1784 (transcription)

Last Will & Testament of Joseph J. Hopkins - 1845

Last Will & Testament of Johns Hopkins - 1873 (external link)

Letters

Johns Hopkins' Letter to Hospital Trustees - 1873 (external link)

See also the Hopkins Family Collection of original materials at Johns Hopkins University.

Primary Document Citations

1691 Will of Gerard Hopkins the First - Maryland, U.S., Wills and Probate Records, 1635-1777 (on ancestry.com)

1743 Will of Gerard Hopkins the Second - Maryland, U.S., Wills and Probate Records, 1635-1777 (on ancestry.com)

1788 Estate Inventory of Johns Hopkins - https://www.familysearch.org/ark:/61903/3:1:33SQ-GTR9-942Y?i=29&wc=SNYW-T36%3A146534401%2C146774801&cc=1803986