Bihar: Hindi Official Language!! Maithili recognised Regional Language while most speak Bhojpuri!! Urdu second official language in 17 out of 38 district!!
Uttar Pradesh: Hindi Official & Urdu Co-Official. Hindi spoken by 85% & next is Bhojpuri by 11%.
Co-Official (which is hardly spoken) isn't Regional in both mentioned state & easily addressed by Hindi as National as well as Official Language & hence visible at large on TB!! Kindly check tone of your words what you post!!