These are the Lancashire schools spending more than they have coming in.
A total of 39 local-authority maintained schools (6.6 per cent) reported a revenue deficit in 2018/19, down from 47 in 2017/18.
The figures include primary and secondary schools, as well as special schools, nurseries and pupil referral units.
Overall, the 39 schools reported a total deficit of £13million in 2018/19.
The total was up from £9.8 million in 2017/18, and from £4million in 2012/13, according to the Department for Education figures.
The average deficit per school in 2018/19 was £333,000.
Across England, there were 1,376 local-authority maintained schools in deficit in 2018/19. That was down from 1,532 in 2017/18.
However, one in 10 (9.9 per cent) schools was still running a deficit last year.
The size of the total schools deficit is growing.
It stood at £233.2 million in 2017/18 - an average of £152,000 per school - but rose to £233.3 million (£170,000 per school) in 2018/19.
That is the highest level since records began in 2002/03.
A Department for Education spokesperson said: "This government has announced the biggest funding boost for schools in a decade, giving every school more money for every child.
"This means that every school in the country can see per pupil funding rise in line with inflation next year, with all secondary schools receiving a minimum of £5,000 per pupil."
Across England, the planned spend per pupil in 2019/20 is £4,556, nominally up from £4,521 in 2018/19.
However, if the 2018/19 figure was adjusted for inflation, it would be £4,602 per pupil, meaning schools are £46 per pupil worse off.
Geoff Barton, General Secretary of the Association of School and College Leaders, said: "Schools have suffered several years of real-terms cuts to the funding they receive from the government which has plunged many into deficit.
“They will be implementing cost-reduction plans to balance their books but this is not a quick fix because it entails reducing staffing costs while trying to minimise the impact on the provision for children.
“Schools which have seen their deficit position worsen are likely to be those which face the greatest financial pressures.
“The government has allocated increased funding to schools over the next three years. However, we do not think this funding will be sufficient to reverse all the cuts that have taken place to school budgets and the likelihood is the financial position will continue to be challenging.
“Schools have had no alternative other than to cut staffing which means they are less able to provide support and a full range of courses and extra-curricular activities, and it has also led to larger class sizes. We are continuing to campaign for improved funding on behalf of schools, parents and pupils.”