From my abstracts of Loudoun Co Deed Books:
3D:335 Date: 7 Jun 1821 Returned to court: 17 Dec 1821
William HERBERT of Fairfax to George KOONTZ and Nicholas KOONTZ of Ldn. Bargain and sale of 100a (except mines of metal and minerals) on Blue Ridge adj __ PURCELL, __ GRUBB. Delv. to Nich’s KOONTZ 10 Mar 1828.
4P:361 Date: __ Oct 1840 Returned to court: 17 Sep 1841
Nicholas KOONCE & wife Elizabeth of Harpers Ferry Jefferson Co Va to David KOONCE. Power of Attorney for sale of lot adj to Bolivar nearly opp. res. of William SMALLWOOD (prch/o George ROWLES dec'd Feb 1827) and lot on Blue Ridge (prch/o William HERBERT by Nicholas & George KOONCE dec'd, Jun 1821). Delv. to KOONCE 23 Aug 1844.
4Q:208 Date: 22 Nov 1841 Returned to court: 14 Feb 1842
David KOONCE (att'y of Nicholas KOONCE & wife Elizabeth) of Jefferson Co Va to George William COCKERELL of Ldn. Bargain and sale of 11a on E side of blue ridge (cnvy/t George KOONCE & Nicholas KOONCE by William HERBERT 7 Jun 1821) adj __ CLENDENING, __ GRUBB, __ DERRY. Delv. to John GRUBB Jr. 24 Jun 1857.
4F:330 Date: 30 Sep 1834 RtCt: 15 Jun 1836
Nelson CHAMBLIN & wife Sarah, Nancy COONCE, John PENN & wife Mary and John FRITZ & wife Rebecca of Ldn to Ellzey CHAMBLIN and Elisha CHAMBLIN of Ldn. Bargain and sale of int. in estate of Ezekiel CHAMBLIN dec'd where widow now resides (except int. of FRITZ in lot assigned to them). Wit: John WHITE, William CLENDENING. Delv. to Ellzey CHAMBLIN 16 Nov 1836.
4P:214 Date: 30 Sep 1832 RtCt: 14 Jun 1841
Nelson CHAMBLIN & wife Sarah, Nancy COONCE, Ellzey CHAMBLIN and Elisha CHAMBLIN of Ldn and John PENN & wife Mary of Jefferson Co Va to John FRITZ & wife Rebecca of Ldn. Bargain and sale of 14¼a (Lot #4 in div. of Ezekiel CHAMBLIN dec'd allotted to John FRITZ exclusive of widow's dower) adj __ DEMORY, __ GRUBB. Wit: John WHITE, William CLENDENING.
This may be related, From “Genius of Liberty” abstracts by Northern Virginia Genealogy:
Vol. V, No. 14 – April 17, 1821
Henry Koontz of Frederick Co., Md., age 94 years, died. [no date of death]