Key Languages of Punjab which are being used most commonly are:
The Pothwari or Pahari-Potwari or Panjistani language (also known as Pothohari or Pothwari-dhanni-mirpuri-pahari/modern Panjistani; Panjistani: پوتوری/پنجستانی; Urdu: پنجستانی) is an Indo-European language spoken in the Potwar district around Rawalpindi, Pakistan to the Cease-fire Line (LoC) of Indian administered Kashmir de-facto border in the Mirpur and Kotli district of Pakistan-administered Kashmir, and as well as in Sui Cheemian (Gujar Khan). It is closely related to Punjabi.
Hindko (Hindko: ہندکو ALA-LC: Hindko IPA: [hɪnd̪koː]), also known as Panjistani or (ambiguously) as Pahari, is a dialect of Western Punjabi (Lahnda) of the Indo-Aryan (Indic) language family spoken in Northern Pakistan. Hindko follows the standardized Punjabi Shahmukhi script for writing.
Jhangvi (جھنگوی), Jhangochi (جھنگوچی), or Rachnavi(رچناوی) is a dialect of the Punjabi language.Jhangvi is spoken in Khanewal, Jhang, Faisalabad and Chiniot. Jhangvi is considered a dialect of Punjabi because it is mutually intelligible with and morphologically and syntactically similar to, the standard Punjabi of Pakistani Punjab. Its name is derived from Jhang.
Shah Puri dialect(also known as Sargodha dialect) is mostly spoken in Pakistani Punjab. It is one of the oldest dialects of the Punjabi language spoken in Sargodha Division of Pakistani Punjab. Its name is derived from the former Shahpur District (now Shahpur Tehsil, being part of Sargodha District). It can be described as a mixture of Majhi, Pothohari, and Thalochi dialects. Shahpurias in the Khushab area speak this dialect in a more Thalochi tone while those in southern parts of its distribution have the color of Jhangochi in their language. It is also called Western Punjabi.
The Pahari languages (پہاڈی)(Urdu) from pahar ‘mountain’) are a geographic group of Indo-Aryan languages spoken in the lower ranges of the Himalayas, from Nepal in the east, through the Indian states of Uttarakhand, Himachal Pradesh, and Jammu and Kashmir, to Azad Kashmir and Murree in Pakistan. The Pahari language bears a strong resemblance to the Gujari language, language and according to some linguistic scholars it is also related to the Punjabi language.
The Majhi is Punjabi’s prestige dialect because it is the standard of written Punjabi. It is spoken in the heart of Punjab in the historical region of Majha which spans the Lahore, Sheikhupura, Kasur, Okara, Nankana Sahib, Faisalabad, Gujranwala, Wazirabad, Sialkot, Narowal, Gujrat, Jhelum, Pakpattan, Vehari, Khanewal, Sahiwal, Hafizabad, Mandi Bahauddin districts of Pakistan’s Punjab Province and also in major cities of Pakistani Punjab.
Saraiki (سرائیکی) is spoken in southern Punjab, which comprises Multan, Lodhran, Bahawalpur, Bhakkar, Mianwali, Layyah, Dera Ghazi Khan, Muzaffargarh, and Rahim Yar Khan districts. It is also spoken by a majority of the population of Dera Ismail Khan district in Khyber Pakhtunkhwa (خیبر پښتونخوا) province, Karachi plain of Balochistan, northern parts of Sindh, and also spoken by few people in the cities of Hyderabad and Karachi.
And the most widely used language in the Province of Punjab is “Punjabi”