Hippocampal principal cells and different subpopulations of interneurons show individually characteristic activity patterns during behavior associated brain states. In order to understand how neurons integrate input from the network, in a series of studies, we estimated the total number of excitatory and inhibitory synapses converging onto different domains of neurons on the CA1 area. We studied the synaptic organization of pyramidal cells as well as 5 functionally distinct subpopulation of inhibitory neurons: PC and CCK containing basket cells, dendrite targeting CB cells, interneuron selective CR cells and the hippocampo-septally projecting neurons (HS cells). We found in the case of all neuron populations (except a subgroup of HS cells) that, inhibition is always stronger on the soma and the proximal dendrites than on the distal dendrites, meaning that the majority of inhibitory inputs arrive onto the perisomatic region. There were however considerable differences in the density (and total number) of excitatory and inhibitory inputs and the ratio of inhibition among the examined cell types. The highest amount of inputs arrived to the pyramidal cells, HS cells and the PV cells (35,000- 15,000), while CCK, CB and CR cells received much less (5,000-2,000). The ratio of inhibition did not correlate with the total excitatory inputs. Thus while the PV and pyramidal cells received dense excitatory input they received relatively small amount of inhibition (2-5%) if averaged over their entire surface. In contrast CCK, CB and CR cells received relatively large amount of inhibition (35-25%), balancing relatively scarce excitatory input. Different domains of pyramidal cells, associated with Schaffer collateral and entorhinal inputs showed characteristically different organization of synaptic inputs. Comparing the excitatory and inhibitory convergence data to the activity level of each neuron types, there is a mismatch. Though for example PV cells and pyramidal cells show extremely similar organization of synaptic inputs their activity pattern is highly different. PV cells are highly active, while CA1 pyramidal cells are less silent than any of the examined inhibitory neuron populations. These findings suggest that the activity level of a neuron is not solely formed by the absolute amount of excitatory inputs and by the ratio of inhibitory inputs, but by other properties, such as the distribution of different types of ion channels and transmitter receptors.