Boone County was the 35th county formed in Kentucky.  The law enacting Boone County was passed on December 13, 1798 the county was formed on June 1, 1799 from Campbell County. Its boundaries are unchanged since March 10, 1870. It has an area of 246.2 square miles, making it the 87th largest of Kentucky's 120 counties. 

A later, 1895 Gazetteer adds:

Bonds of Boone County Tavern Keepers from 1869 - 1870 are listed here.

"That we have too many pistols engaged in adjusting disputes in the country, and especially in this county, is a deplorable fact, which is attested to by the frequent display of these peace makers (?), if not by bringing them into use also." 
 The Boone County Recorder, February 22, 1898

"It will be remembered that about ten years ago [March 28, 1859], the steamers Nat. Holmes and David Gibson, the one ascending and the other descending the Ohio river, collided a short distance above Aurora.  The Holmes was a complete wreck, many lives were lost, and a large amount of property were destroyed." from Lawrenceburg, Indiana's The Register, May 28, 1868.

The 1878 Biographical Encyclopedia of Kentucky
 had these entries for folks with a Boone County connection (all are pdf's)

Cave Johnson came to Kentucky in 1779, and died at North Bend in 1850.  The Boone County
Recorder published some of his reminiscences, and those can be read here. (pdf)

Most states track the largest tree of each species on the state.  Kentucky's list is here, and you'll find Boone Co has the largest Red Buckeye, and the largest Northern Red Oak in the state.

UK excavated a number of Adena Culture era (c. 1000 - 200 BC) mound around 1940.  Boone County has more of these sites than most counties in the Adena area.

The WPA Writers Project from the late 1930's conducted a number of interviews
with ex-slaves.  The only one from Boone County is this one (pdf), but I suggest
 you take everything it says with a large grain of salt.  The Uncle Tom's
 Cabin references are just flat wrong.

"$100 REWARD.  Runaway from the farm of  owned by Alexander Marshall, deceased, on the 31st day of August, 1845, a negro boy by the name of George, about 5 feet 2 or 3 inches high; 16 years old; tolerably dark, heavy set boy for that age; had on a linen shirt and pants, yellowish linsey [*rmus (sp??)], no hats no shoes. The supposition is that he was aided away.  The above reward will be given if taken out of State, and $25 if taken in the State  and secured in any jail so that I can get him again. WM MARSHALL, Boone co., Sept. 13, 1845" 
in the Licking Valley Register, September 13, 1845

Boone County was formed from a part of Campbell County in 1799.  It was the 30th county to be formed in Kentucky, and is named for, uh, Daniel Boone.  (You knew that, right?)  More info?  Google lists about 1,390,000 or so mentions for Dan'l, here, or, you can read his bio.  That's a link to a good Boone biography at Amazon on the right. Recommended.

A 1923 Boone County Map, before I-75, before
 US 42, and before the airport.

Judge acquits murderer in Boone
 County in 1858, story here. 

The story of the lynching of Charles Dickson
 in Boone County, in 1884 , here.

In 1969, Edna Talbott Whitley compiled a list of Cabinetmakers in Kentucky.  The Boone County portion of that list is here.

Phone numbers used to have
 letters in them? Here.

Boone County sites placed on the National Places of Historical Places are here.

Boone County Officials, 1847, here.

A List of the Boone County Historical
Markers is at this site.

You can read a proposal to build the Covington, Big Bone, and Carrollton Railroad, here.

A List of Boone County Cemeteries is at this site.  You will also want to look at this site.

Random Boone County News,
circa 1813, is here.

In 1919, there was a farm census,
counting livestock, crops and farms. 
Boone County's is here.

Visit Philip Naff's In The Region, a site
 devoted to Boone County History
 and Genealogy, here.

A site dedicated to the bridges of
Boone County is here.

Boone County Cemetery Records are
 at this site.

A status report from the Superintendent of Schools in Boone County from 1900 is here.

The Dinsmore House's site is here.

This site gives an account of the
exploding of the steamer Fanny Fern
at North Bend in 1858.

Before King's Island, before Coney Island, and even before the Ludlow Lagoon, there was Boone County's Parlor Grove Amusement Park.  Read all about it, here.

An ad for the 1870 Fair
 

An ad for the 1877 Fair
 

You can sign up to get on the Boone County Genealogical Mailing List by the following the instructions you'll find here.

The Kentuckiana Digital Library has a number of Boone County images.  Quality is erratic, but it's worth a look, here.

The Boone County Roots Web site is here.

The Biography section of Roots Web for Boone County Citizens is here.

"Three slaves, two men and a woman, belonging to Mr. Piatt, who lives in Kentucky, just across the river from our city, ran away from their owner on Tuesday night of last week.  They got as far up in Ohio as Bellefontaine, where they were recognized and arrested by a brother of Mr. Piatt, at whose house they had stopped to get something to eat.  A dispatch, stating the arrest, having reached the owner of the slaves, he started, accompanied by five men, for Bellefontaine, but got there in time to be too late to get his property.  The abolitionists had taken them by force and sent them on their way, and Mr. P. had to return without their desirable company."
  the Independent Press of Lawrenceburg, Indiana, November 10, 1852

"We understand that Mr. A. S. Piatt is about to commence a suit against the Little Miami Railroad Co. to recover the value of slaves that recently escaped from his estate in Kentucky."  the Independent Press of Lawrenceburg, Indiana,  December 1, 1859.

There's a list of the 14 Boone County post offices of 1885, listed by the amount of revenue each generated.  Here.

 In 1900, John James Piatt edited and published a book of various pieces he called The Hesperian Tree: An Annual of the Ohio Valley - 1900.  The entire text is online at Google Books, here.

A couple of items from it deal with Northern Kentucky history.  The first is a chapter John Uri Lloyd wrote for, but did not include, in his Stringtown on the Pike.  It’s about two tramps walking down the Ohio River on the Indiana shore, and the dialogue between them, as one explains to the other features and facts about the Kentucky side of the river.  It’s a pdf, and you can read it here. 

The second is a series of four short pieces by Kenneth Lake: one lamenting the loss of the ability to whip slaves at the whipping post, a feud between two men, the wonderful saga of the Petersburg Racing Association, and last but not least an account of fox hunting in Boone County.  It’s a pdf also, and it’s here.

The back pages of the book feature advertisements with blurbs from reviews that say very nice things about Mr. Piatt's and Mrs. Piatt's poetry.  The blurbs had a higher opinion of it than I do.

"Abner Gaines was the contractor for carrying mail from Georgetown to Cincinnati, Ohio, three times a week and back, in four-horse post coaches, from 1st January, 1828 to 31st December, 1831, at a compensation of one thousand seven hundred and ninety dollars per annum.

"On the 8th October, 1831, he was allowed for carrying three additional mails a week between Gaines' cross roads [Walton] and Burlington, twelve miles, from 1st January, 1828, to 31st December, 1831 at the annual rate of $144.40."
both from the Public Documents of the 23rd Congress, December 1, 1834

"Petersburg, Ky., - The Boone County Telephone Company will extend its lines to Belleview and Rabbit Hash, which connection will be made with the Southern Indiana Association by cable under the Ohio river."
The American Telephone Journal, 1902