I have quite a few Haslingden namesover different periods whe my trace on my Accrington lines disappeared. I have covered Accrington and surrounding villages but you will appreciate that the Howarths were the equivalent of Smith or Brown at that time. If you have anything specific will look up my list. Workers in the Mill towns and villages moved around a lot through change of job, imarriage etc.As Laurence appears on your line and is not common to Howarths perhaps this entry from Accrington may be relevant
John HowarthmarriedElizabethRishtonat Accrington29/3/1744Children baptisedAnn30/10/1744Peter30/6/1745John20/3/1747Laurence 8/10/1749Thomas8/9/1754.Presume you have also looked at Haslingden Grane records.