LOUDOUN CO, VA.
Index to the Tithables of Loudoun County, Virginia, 1758-1786
Author: Hopkins, Margaret Lail Date of Publication: 1991
Tetrick (various spellings) :
1763 Henry and Christopher
1764 “ “
1765 “ “
1768 “ “
1770 “ “
1771 Shelburne Twp Henry
1772            Cameron Twp Christopher
1773 Shelburne Twp George Theophilus
1774 Shelburne Twp George Cameron Twp Christopher
1774
1775 Shelburne Twp Henry Cameron Twp Christopher
1776 `          Cameron Twp Christopher
1777           Cameron Twp Christopher
1780           Cameron Twp Christopher
1783           Cameron Twp Christopher

[Another analysis by Duane Boggs of Loudoun County, Virginia Tithables, 1758-1786”, by Marty Hiatt and Craig Roberts Scott (1995), Vol. 1.]
Loudoun County, Virginia Tithables 1764, 1765, 1770, 1771, and 1772 include a Chris. in the household of, and tax paid by, Henry Teterick, Titerich, Teetrety, Teetrick and Teetrick.
In 1771, Loudoun was split into two separate parishes. Thereafter, Chris. appeared as a titheable, and head of his own household, in 1775 (Cameron Parish) and 1780.

Loudoun County Records

10 May 1772: Indenture from John Carlyle to Daniel Lovett, describing land with mention of “Tetrick’s lott” and “Tetrick’s Corner” and referring to “Seconnels Run”. (Comment: This is modern-day Sycolin Run, just South and East of Leesburg (in Loudoun County)). [Source: “Loudoun County Deed Abstracts”, by Sam and Ruth Sparacio (Antient Press, McLean VA 1989), at pp. 110-111, from original documents, at pp. 428-430]
22 June 1772, Road Construction:
From Goodwin’s to Leesburg Vizt. George Nafies 1 Hand, William Roberts 2 Hands, Peter Carr 2 Hands, John Carr Senr. 1 Hand, John Carr Junr. 1 Hand, Christopher Tetrick 1 Hand, Henry Tetrick 2 Hands, Thomas Carr 1 Hand, Hamilton Rogers 2 Hands, John Beaty 3 Hands, John Weir 1 Hand, Craven Peyton 3 Hands, Samuel Tillett 3 Hands, Mann Page Junr. 3 Hands, Christopher Perfect 3 Hands, John Redford 1 Hand, John Herryford 3 Hands, James Cummings 2 Hands, Thomas Pugh 1 Hand, William Folks 1 Hand, and John Williams 2 Hands. [Source: Loudoun Order Book E, p. 341]

1781: George Tetrick was listed as having "deserted" the Loudoun County Militia as of May 11, 1781. [Source: Northern Virginia Genealogy (Vol. 1, No. 4, 1996) at pp. 169-173.]

10 May 1790, Ann Tetrick. Two children. James Robertson, adjudged father, to pay 7 pounds per year for each child until 6 years old." [Source: "Apprentices, Poor Children and Bastards: Loudoun County, Virginia, 1757-1850", by Louisa Skinner Hutchison (2000), at p. 152 ("Bastard Children")]

1797: Loudoun Co: John Tetrick sued James Fox
http://www.lva.virginia.gov/chancery/case_detail.asp?CFN=107-1798-010