From visual inspection of the three LOw-Frequency ARray (LOFAR) deep fields, namely the Bootes, ELAIS-N1, Lockman Hole, covering a total area of 95 deg^2^, we compile a list of 1609 radio galaxies (RGs) with a projected angular size larger than about 30 arcsec. We present their host galaxies with either spectroscopic (when available) or else photometric redshift estimates culled from various different references, and use these to estimate their projected linear sizes. We compare the radio, optical properties of GRGs with those of a control sample of smaller RGs, and explored their environment in terms of the surface number density of neighbouring galaxies within these surveys. Integrated flux densities and radio luminosities were determined for a subset of RGs through available survey images at 50, 150, 610, and 1400 MHz to compute integrated spectral indices. We find that GRGs preferentially reside in sparser environments compared to their smaller counterparts. Only 3.6% of the GRGs reside within a 3D comoving distance of 5 Mpc from a previously reported galaxy cluster, and that larger sources exhibit steeper integrated spectral indices, suggesting that GRGs are late-stage versions of RGs.

Cone search capability for table J/A+A/686/A21/tablea1 (Radio and optical data for 1609 Extended Radio Galaxies (ERG))