Son of George & Rachel (Law) Caslin/Casland.
Married to Elizabeth Woods.
Dr. J. N. McCasland was appointed Deputy Clerk for Pawnee County, which position he held until 1864.
Pawnee Hotel, built in 1867 & 1868, was owned by Jeremiah McCasland and sold to Governor David Butler.

In the 1830 US Federal Census for Montgomery, Jennings, Indiana, George McCaslin has in his household three males under 5 (George William, John aka J.F.C and Andrew), two males 5 to 10 (David and Jeremiah), two males 10 to 15 (Joseph and Lemuel), one male 40 to 50 (himself), one female under 5 (Alminda), one female 10 to 15 (Anzeline) and one female 30 to 40 (his wife Rachael Laws McCaslin). 

In the 1840 US Federal Census for Lancaster, Jefferson, Indiana George McAslin [McCaslin] has in his household one male under 5 years [Walter Allen], two males 5 to 10 years [Henry Wasson and Richard M], two males between 10 and 15 years [Alexander W and John Finley C], two males between 15 and 20 [George William, Jeremiah Newton], two males between 20 and 30 years [Lemuel and David, Joseph H has married], one male between 50 and 60 years [himself], one female under five years [unknown], one female between 5 and 10 years [Kessy J (Hessy)], one female between 10 and 15 years [Almanda], one female between 15 and 20 years [Anzeline] and one female between 40 and 50 years [George's wife, Rachel Laws].

In the 1850 US Federal Census for Smyrna, Jefferson, Indiana, 28-year-old farmer Jermiah McCasland [McCaslin], his 20-year-old wife Elizabeth A, and their children 4-year-old Mary A and 2-year-old Louisa W are living on a farmstead next to his 60-year-old father George, his 54-year-old mother Rachel [Law] McCasland [McCaslin] and his siblings, 19-year-old Hessy J, 17-year-old Richard, 16-year-old Henry, and 12-year-old Walter. 

From Andreas History of the State of Nebraska-Pawnee County:
"Pawnee City was surveyed by Josiah J. Lebo, County Surveyor, in January, 1857. The land was described as the southwest quarter of Section 11 east. The survey was made by the order of Messrs. E. W. Fowler, John C. Peavy and Joseph Fries, the then County Commissioners. In July, 1858, Table Rock was incorporated as a town, and Pawnee City, as its untiring rival, followed its example. It was incorporated under the style of the town of Pawnee, upon the petition of J. S. Woods, J. N. McCasland, A. C. Dean, Fielding Liming, J. B. Norton, B. P. Beebee and J. W. Cochran -- the first five gentlemen being named as the Board of Trustees."

"Settlers of 1858 -- J. W. Cochran, Mr. Zeke, Washington Allen, Dr. J. N. McCasland, William Horn, Abraham Clayton, William B. Raper, A. D. Liming and Daniel Liming, on Turkey Creek; C. W. Giddings, John A. Jones, William Smith, Julius Tyler, Peter Gartner, George P. McMahon, Samuel McMahon, L. M. Mumford, Samuel Spece, Luke Bradley and Nathan G. Hand, on the North Fork; Horace Bemis, William Carkey, R. G. Cowperthwaite and John Colony, on Jake's Run; Mr. Burg (father of John and William Burg), John Tillotson, George W. Welsh, William Scott, Andrew Oliver, William Oliver, John Turnbull, Robert Fairbairn, William Fairbairn, J. L. Wymore, Fred Wymore and Isaac Lockand, on Johnson Creek and its tributaries John W. Gregory, Mark Killeen, John Connolly and the Bailes family, on Plumb Creek; Buell Woodruff, Lucas Covert, W. W. Denney and John A. Butler, on Ball's Branch; John W. Manning, on the West Branch of Turkey Creek;Robert tailor, on tailor's or Hogin's Branch; and William and Gottifried Burrow and Christian Frank on Long Branch."

Dr. J N McCasland opened a drug store in Pawnee City in 1860.

In the 1860 US Federal Census for Pawnee, Nebraska Territory, 36-year-old physician J. N. [Jeremiah N] McCasland owns $2,000 in real estate and $200 in person property. He and his 30-year-old wife Elizabeth [Woods] McCasland have in their household their children 11-year-old Louisa F, 9-year-old Rachel E, 4-year-old Lillybell and 2-year-old Laura L, 23-year-old hired hand William N Davis and Jeremiah's brother, 33 -year-old blacksmith J F C McCasland. Louisa, Rachel and Lillybell have attended school in the past year. All the children were born in Indiana, which means the family moved to Nebraska Territory after 1858. Their oldest child Mary is missing from the household and presumably has died before 1860.

In the 1870 US Federal Census for Pawnee, Nebraska Territory, 48-year-old physician J. N. [Jeremiah N] McCasland owns $5,000 in real estate and $1,000 in person property. He and his 30-year-old wife E.A. [Elizabeth Ann Woods] McCasland have in their household their children, 21-year-old Louisa, 19-year-old Elnora [Rachel Elnora McCasland] Butter [Butler], 14-year-old Lilly, 9-year-old Minnie, 5-year-old Ettie, one-month old Herman, and their grandson, Elnora's child 3-year-old Andrew Butter [Butler]. Minnie and the younger children were all born in Nebraska, while Lilly, Elnora, Louisa and their parents were all born in Indiana. Lillie, Minnie and Hattie have all attended school in the past year. Elnora must have married when she was 15 or 16 years old. 

In the 1880 US Federal Census for Pawnee City, Pawnee, Nebraska, 58-year-old Indiana-born physician and surgeon Jerimiah McCasland and his 50-year-old Indiana-born wife Elizabeth [Woods] have in their household their youngest Nebraska-born children, 17-year-old Hattie C, 15-year-old Ettie M, and 10-year-old Herman C. Ettie and Herman have attended school in the past year. Jerimiah's parents were born in Kentucky whereas Elizabeth's father was born in Kentucky and mother in Indiana.

JEREMIAH N. McCASLAND, M. D., has been a practicing physician of good repute for a period of over thirty years, and has spent the greater part of this time in Pawnee City, having come to Nebraska Territory as early as 1858. As may be supposed, there were then but a few unimportant houses on the site of this present wealthy and flourishing town. The young physician opened an office, and although not being at first rushed with business, performed his duties as faithfully and conscientiously as if a thousand people were watching his movements. This course bore its legitimate fruits in the confidence and esteem of the people for miles around, and in due time he found himself on the high road to prosperity. He is now numbered among the most skilled and reliable practitioners of the county. It may be proper to glance at the opening years of the life of our subject, which were spent in the vicinity of the town of Madison, in Jefferson County, Ind., where his birth took place Sept. 3, 1821. His father, George McCasland, was a native of Kentucky, a wheelwright during the most active years of his life, and later engaged in agricultural pursuits. He married a lady of his own State, Miss Rachel, daughter of Jeremiah Laws, of Mercer County, Ky., and they lived there until 1830. They then emigrated [sic] to Indiana, where they spent the remainder of their days. The household circle of George McCasland and his estimable wife was completed by the birth of fourteen children, who, with one exception, all lived to attain their majority. Jeremiah N. was the fifth child. He pursued his first studies in the schools of his native county, where he continued to reside with his parents until twenty-three years of age. Probably the first important event of his life was his marriage with Miss Elizabeth A., daughter of Joseph Woods. The Woods family removed from Jefferson to this county in 1857. After their marriage the Doctor and his wife settled in Jefferson County, Ind., where our subject engaged in the milling business on the waters of Big Creek, and where he operated successfully a number of years. Thence he removed to Jackson County, Ind., and conducted a gristmill four years. In the meantime he utilized his leisure hours in reading medicine, and availed himself of the excellent instruction of Dr. Green. When sufficiently advanced he entered upon a course of lectures in the Medical College at Louisville, Ky., and a few months later commenced the practice of his chosen profession as the partner of his old instructor, Dr. Green. He left Indiana in the spring of 1858, coming to this county, and his after course we have already indicated. Only a comparatively brief time had elapsed until he was appointed by Gov. Butler First Assistant Physician for the Insane Asylum at Lincoln, a position which he held two years. Upon retiring from this he resumed his practice in Pawnee City and vicinity, and was fully established years ago as one of its leading physicians. Dr. McCasland, as one of the early pioneers of Pawnee County, looked upon this region of country before the streams were bridged, and before there was a railroad line west of St. Louis. No man has taken a livelier interest in the growth and progress of his adopted county, and he has contribyted to its prosperity in no small degree. He is the father of eight children, three of whom died at a tender age. The eldest of the survivors is Louisa, the wife of James Butler, and residing in this city; Elnora is married to her second husband, B. F. Hill, and lives in St. Joseph, Mo.; Lilly B. is the wife of J. R. Ervin; Minnie married M. M. Paddon; Hattie lives at home with her parents, and Etta is the wife of Ed. S. Ames.
Dr. McCasland also gained the title of Honorable during the Territorial days, having been elected by the Republicans of Pawnee County to represent them in the Legislature, in which he served two terms. In religious matters he inclines to the doctrines of the Christian Church, of which he is a member. For good and sufficient reasons he left the Republican party in 1882, and became a supporter of the Cleveland administration. He voted for John C. Fremont in 1856, Socially, he belongs to Pawnee Lodge No. 23, A. F. & A. M., and is a charter member of Interior Lodge No. 9, I. O. O. F.
David McCasland, the paternal grandfather of our subject, was born in Virginia, whence he removed with his parents to Kentucky when a mere child. He was of Welsh ancestry, the great-grandfather of our subject having emigrated from Scotland probably during the Colonial days. The mother of our subject traced her forefathers to Wales.

From The Sunday State Journal for 9 May 1909:
"...Dr Jeremiah Newton McCasland, member of the council from Pawnee county was a native of Kentucky, born in 1821, and died at Pawnee City in 1891. He settled at Pawnee City in 1858, and began the practice of medicine. He served in both the tenth and eleventh sessions of the teritorial legislature. He was an active member of the Christian church. He left six children, three of whom are residents of Lincoln--Mrs. James M. Butler, Mrs. J.R. Irvine [sic] and Mrs. J.D. Parker."

Thanks goes to Lois Johnson for this information!
McCaslin/McCasland researcher