To build at least 10,000km of new tarmac roads across the country, President Ruto said about Sh1.5 trillion was needed.
He pointed out that traditional budgetary funding for road projects alone was no longer adequate.
"I am going to address Parliament next week over various development initiatives," he announced.
He told Marsabit residents that the county has been allocated Sh4.5 billion to build affordable housing, fresh produce markets and student hostels for public colleges.
Additionally, the President said Sh1.6 billion has been set aside to connect more households to electricity.
On requests by local leaders for the establishment of more administrative units, he told Interior Cabinet Secretary Kipchumba Murkomen, who was present, to look into the matter.
"We will look into your requests to create more administrative units, including sub-counties. The minister is here. You can send your proposal on the matter," he told the leaders.
The President commended the role the Church plays in development and mission work, saying the government will continue to work with religious organisations to address the challenges facing the people.
On his part, Mr Murkomen said teamwork among leaders in the county had greatly helped resolve inter-clan conflicts that were rampant in the recent past.
He thanked the Church for working closely with the government in addressing insecurity, saying the move has helped restore peace.
"Churches, and the religious sector in general, are close partners in our efforts to maintain peace and resolve conflicts," Mr Murkomen pointed out.
He said more than 72,000 residents in Marsabit were eligible for ID registration, and urged them to take advantage of the government's free issuance of the documents
Governor Mohamud Mohamud and local MPs thanked the government for initiating various development projects in the county, which had been marginalised by previous governments.
"We have resolved as leaders of this county to support the re-election of President Ruto because of his commitment to the transformation of the country," said Governor Mohamud.