These parties are hitherto less known in the country's political spectrum, but come elections they play a key role as they can decide the prospect of a candidate, especially this time when the stakes are very high.
Some of the leaders, who have named their parties after their castes to garner votes, have termed big political parties as 'bahri' (outsider).
Some of these caste-based parties are also testing their popularity in eastern Uttar Pradesh, seeking to extend their territory.
While Bhartiya Kisan Union (BKU) is not in the fray this time, there are a number of small parties championing the cause of farmers and helping big parties to garner votes by highlighting their farm policies and promises.
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Outfits like Bhartiya Vanchit Samaj Party, Bhartiya Karyastha Sena, Kisan Mazdoor Suraksha Party and Bhartiya Bhaichara Party are toiling hard to make their presence on the state's electoral map.
While the first of seven-phase polling for 73 seats in 15 districts is over, the second phase of polling on February 15 will cover 67 seats in 11 districts -- all in western Uttar Pradesh.
Outfits like little-known Suheldev Bhartiya Samaj Party or Janwadi Party (Socialist), headed by Sanjay Singh Chauhan, matter for mainstream political parties like BJP and Congress because of the support they enjoy among certain castes.
The Paschimi Uttar Pradesh Vikas Party is raising the issues that have not been touched upon by major parties.
Seeking to leave their mark in state politics, Peace Party, Nishad Party and Mahan Dal are also in the fray.
OBCs are roughly 44 per cent of UP's electorate, Dalits 21 per cent, Muslims 19 per cent, and upper castes 16 per cent. Yadavs, the core of the SP's base, are numerically and socially dominant among OBCs.
Perhaps with this factor in mind, Chief Minister Akhilesh
The 17 sub-castes which the government wants included in the SC category are Kahar, Kashyap, Kewat, Nishad, Bind, Bhar, Prajapati, Rajbhar, Batham, Gauriya, Turha, Majhi, Mallah, Kumhar, Dheemar, Dheewar and Machhua.
Though individually each has a very small vote share, yet together, they make up a significant chunk of votes.
The Peace Party of India (PPI), which had won four seats in last elections in 2012, has its support base among Muslims.
The Nishad Party banks on votes of fishermen in parts of eastern UP where the Nishad community has sizeable presence.
Suheldev Bhartiya Samaj Party enjoys support among Rajbhar caste, while Mahan Dal has emerged as an important player in places like Badaun, Etah, Bareilly, Shahjahanpur and Farrukhabad.
The party enjoys support among politically active Shakya, Maurya, Kushwaha and Saini communities.
BJP recently inducted the former BSP national secretary Swamy Prasad Maurya in the party, and made another Maurya leader, Keshav Prasad Maurya, its state unit chief.
The ruling Samajwadi Party is not oblivious to the need to reach out to non-Yadavs. Perhaps that is the reason why SP chief Mulayam Singh Yadav brought back his friend-turned-foe and prominent Kurmi leader Beni Prasad Verma and made him Rajya Sabha MP.