As you want contact number of Booking Counters of Himachal Pradesh Road Transport Corporation, so here I am providing complete contact details of all Booking Counters:

Booking Counters are located in:
Shimla
Hamirpur
Chandigarh
Manali
Kullu
New Delhi
Kangra
Haridwar
Dharamshala

Contact Details of Booking Counters:

SHIMLA
H.R.T.C.,
Advance Reservation Counter No. 8,
ISBT, Shimla
( 8:00AM to 8:00PM )
Tel. Number : 91-177-2658765

H.R.T.C.,
Advance Reservation Counter,
Near Scandal Point,
The Mall, Shimla
( 11:00AM to 7:00PM )

HAMIRPUR
H.R.T.C.,
Advance Reservation Counter ,
Bus Stand, Hamirpur
Tel. Number : 91-1972-222893

CHANDIGARH
H.R.T.C.,
Advance Reservation Counter ,
ISBT Sector 43, Chandigarh
Tel. Number : 91-172-2668943

MANALI
H.R.T.C.,
Advance Reservation Counter ,
Bus Stand, Manali
Tel. Number : 91-1902-252323
91-1902-251624

KULLU
H.R.T.C.,
Advance Reservation Counter ,
Bus Stand, Kullu
Tel. Number : 91-1902-222728

NEW DELHI
H.R.T.C.,
Advance Reservation Counter No. 40 & 8,
1st Floor, ISBT Kashmiri Gate,
New Delhi-110 001
( 7:00AM to 9:00PM )
Tel. Number : 91-11-23868694, 91-11-23863473
Traffic Manager : 099687-74008

H.R.T.C. Advance Reservation Counter ,
Himachal Bhawan Camps,
Mandi House,
New Delhi
( 2.00PM to 8:00PM )
Tel. Number : 092124-02085

KANGRA
H.R.T.C.,
Advance Reservation Counter ,
Bus Stand, Kangra
Tel. Number : 91-1892-260219
91-1892-260219

HARIDWAR
H.R.T.C.,
Advance Reservation Counter ,
Bus Stand, Haridwar
Tel. Number : 91-1334-222781

DHARAMSHALA
H.R.T.C. Advance Reservation Counter,
Bus Stand, Dharamsala
Tel. Number : 91-1892-224903

H.R.T.C. Advance Reservation Counter ,
Bus Stand, Mecleodganj
Tel. Number : 91-1892-221750