  We present QUIJOTE intensity and polarization maps in four frequency bands
centred around 11, 13, 17 and 19GHz, and covering approximately 29000 deg$^2$,
including most of the Northern sky region. These maps result from 9000 h of
observations taken between May 2013 and June 2018 with the first QUIJOTE
instrument (MFI), and have angular resolutions of around $1^\circ$, and
sensitivities in polarization within the range 35-40 $\mu$K per 1-degree beam,
being a factor $\sim 2$-$4$ worse in intensity. We discuss the data processing
pipeline employed, and the basic characteristics of the maps in terms of real
space statistics and angular power spectra. A number of validation tests have
been applied to characterise the accuracy of the calibration and the residual
level of systematic effects, finding a conservative overall calibration
uncertainty of 5%. We also discuss flux densities for four bright celestial
sources (Tau A, Cas A, Cyg A and 3C274) which are often used as calibrators at
microwave frequencies. The polarization signal in our maps is dominated by
synchrotron emission. The distribution of spectral index values between the
11GHz and WMAP 23GHz map peaks at $\beta=-3.09$ with a standard deviation of
0.14. The measured BB/EE ratio at scales of $\ell=80$ is $0.26\pm 0.07$ for a
Galactic cut $|b|>10^\circ$. We find a positive TE correlation for 11GHz at
large angular scales ($\ell \lesssim 50$), while the EB and TB signals are
consistent with zero in the multipole range $30 \lesssim \ell \lesssim 150$.
The maps discussed in this paper are publicly available.
