 For its entire length , SR 319 runs along the boundary between Darke County on the south side and Mercer County on the north side . SR 319 begins in downtown Burkettsville at a former railroad grade just west of Washington Street . Known as Main Street within Burkettsville , the route runs due east through the village 's central business district prior to entering a residential area where it intersects a few side streets . After leaving the village of Burkettsville , SR 319 becomes the boundary between Darke County 's Allen Township and Mercer County 's Granville Township . After a short distance through farmland , the highway comes to an end as it arrives at its junction with SR 118 . Continuing east after the route terminates is Darke – Mercer County Line Road . 
 For its entire length , SR 319 <a href='uninflect' title='1'><mark>runs</mark></a> along the boundary between Darke County on the south side and Mercer County on the north side . SR 319 <a href='uninflect' title='2'><mark>begins</mark></a> in downtown Burkettsville at a former railroad grade just west of Washington Street . Known as Main Street within Burkettsville , the route <a href='uninflect' title='3'><mark>runs</mark></a> due east through the village <a href='null_genetive' title='4'><mark>'s</mark></a>central business district prior to entering a residential area where it <a href='uninflect' title='5'><mark>intersects</mark></a> a few side streets . After leaving the village of Burkettsville , SR 319 <a href='uninflect' title='6'><mark>becomes</mark></a> the boundary between Darke County <a href='null_genetive' title='7'><mark>'s</mark></a>Allen Township and Mercer County <a href='null_genetive' title='8'><mark>'s</mark></a>Granville Township . After a short distance through farmland , the highway <a href='uninflect' title='9'><mark>comes</mark></a> to an end as it <a href='uninflect' title='10'><mark>arrives</mark></a> at its junction with SR 118 . Continuing east after the route terminates <a href='drop_aux' title='11'><mark>is</mark></a>Darke – Mercer County Line Road . 
For its entire length , SR 319 run along the boundary between Darke County on da south side and Mercer County on the north side . SR 319 begin in downtown Burkettsville at a former railroad grade just west of Washington Street . Known as Main Street within Burkettsville , tdaroute run due east thru the village  central business district prior to entering a residential area where it intersect a few side streets . After leaving thdaillage of Burkettsville , SR 319 become thedaundary between Darke County  Allen Township and Mercer County  Granville Township . After a short distance through farmland , the dahway come to an end as it arrive at its junction w SR 118 . Continuing east after the rdae terminates Darke – Mercer County Line Road .